C# I need to make a program that follows the given prompts: ### Prompt $1-$ Instantiate a Bank

Write a code snippet to create an instance of a $`$Bank$`$ with a specified name and maximum number of accounts.

### Prompt $2-$ Create Bank Accounts

Instantiate several $`$BankAccount$`$ objects with different account numbers and associate them with the bank instance created in prompt $1.$

### Prompt $3-$ Deposit Money

Write a method to deposit a certain amount of money into one of the $`$BankAccount$`$ instances.

### Prompt $4-$ Withdraw Money

Implement a code snippet to withdraw an amount from a $`$BankAccount$`.$ Check if the withdrawal is successful.

### Prompt $5-$ Check Account Balance

Display the balance of a specific $`$BankAccount$`$ after performing deposit and withdrawal operations.

### Prompt $6-$ Handle Insufficient Funds

Attempt a withdrawal that exceeds the account balance and handle the $`-1`$ that is returned by displaying an appropriate message.

### Prompt $7-$ List All Accounts in a Bank

Loop through all accounts in a bank and display their details $($account number and balance$).$

### Prompt $8-$ Transfer Funds Between Accounts

Transfer funds from one account to another within the same bank. ### Prompt $9-$ Bank Capacity Check

Try adding more $`$BankAccount$`$ instances to the bank than its maximum capacity allows and handle the error gracefully. This is the code I have now, but I am getting an error saying : An unhandled exception of type 'System.NullReferenceException' occurred in Bank.dll: 'Object reference npublic class Bank

$\{$

public string Name $\{$ get; set; $\}$

public BankAccount$[]$ AccountList $\{$ get; set; $\}$

public int NextOpenIndex $\{$ get; set; $\}$

public Bank$($string bankName, int maxNumAccounts$)$

$\{$

Name $=$ bankName;

AccountList $=$ new BankAccount$[$maxNumAccounts$]$;

NextOpenIndex $=0$;

$\}$

public Bank$($string bankName, BankAccount$[]$ bankAccounts$)$

$\{$

Name $=$ bankName;

AccountList $=$ bankAccounts;

NextOpenIndex $=$ bankAccounts.Length;

$\}$

public bool AddAccount$($BankAccount account$)$

$\{$

if $($NextOpenIndex $<$ AccountList.Length && $!$AccountList.Contains$($account$))$

$\{$

AccountList$[$NextOpenIndex$]=$ account;

NextOpenIndex$++$;

return true;

$\}$

else

$\{$

Console.WriteLine$("$Cannot add account. Either the bank is full or the account already exists."$)$;

return false;

$\}$

$\}$

public bool Transfer$($BankAccount accTransferFrom, BankAccount accTransferTo, double amount$)$

$\{$

if $($accTransferFrom$.$Balance $>=$ amount$)$

$\{$

accTransferFrom.Withdraw$($amount$)$;

accTransferTo.Deposit$($amount$)$;

return true;

$\}$

else

$\{$

Console.WriteLine$("$There are insufficient funds in account."$)$;

return false;

$\}$

$\}$

public void ListAllAccounts$()$

$\{$

Console.WriteLine$($$"Bank: $\{$Name$\}")$;

foreach $($var account in AccountList$)$

$\{$

Console.WriteLine$($$"Account Number: $\{$account$.$AccountNumber$\},$ Balance: $\{$account$.$CheckBalance$()\}")$;

$\}$

$\}$

$\}$

public class BankAccount

$\{$

public string AccountNumber $\{$ get; set; $\}$

public double Balance $\{$ get; set; $\}$

public BankAccount$($string accountNumber, double initialBalance$)$

$\{$

AccountNumber $=$ accountNumber;

Balance $=$ initialBalance;

$\}$

public void Deposit$($double amount$)$

$\{$

Balance $+=$ amount;

$\}$

public bool Withdraw$($double amount$)$

$\{$

if $($Balance $>=$ amount$)$

$\{$

Balance $-=$ amount;

return true;

$\}$

else

$\{$

Console.WriteLine$("$Insufficient funds."$)$;

return false;

$\}$

$\}$

public double CheckBalance$()$

$\{$

return Balance;

$\}$

$\}$

class Program

$\{$

static void Main$()$

$\{$

$//$ Prompt $1-$ Instantiate a Bank

Bank myBank $=$ new Bank$("$MyBank$",5)$;

$//$ Prompt $2-$ Create Bank Accounts

BankAccount account$1=$ new BankAccount$("001",1000)$;

BankAccount account$2=$ new BankAccount$("002",500)$;

BankAccount account$3=$ new BankAccount$("003",1500)$;

myBank.AddAccount$($account$1)$;

myBank.AddAccount$($account$2)$;

myBank.AddAccount$($account$3)$;

$//$ Prompt $3-$ Deposit Money

account$1.$Deposit$(200)$;

$//$ Prompt $4-$ Withdraw Money

account$2.$Withdraw$(100)$;

$//$ Prompt $5-$ Check Account Balance

Console.WriteLine$($$"Account$1$ Balance: $\{$account$1.$CheckBalance$()\}")$;

$//$ Prompt $6-$ Handle Insufficient Funds

account$3.$Withdraw$(2000)$; $//$ This willot set to an instance of an object.$\text{'}$