Consider the following class, which uses the instance variable balance to represent a bank account balance.

public class BankAccount { private double balance; public double deposit(double amount) { /* missing code */ } }

The deposit method is intended to increase the account balance by the deposit amount and then return the updated balance. Which of the following code segments should replace /* missing code */ so that the deposit method will work as intended?

• amount = balance + amount;

  return amount;

• balance = amount;

  return amount;

• balance = amount;

  return balance;

  balance = amount;, , return balance;,

• balance = balance + amount;

  return amount;

  balance = balance + amount;

• return balance;