Write a function Define a global variable and have it reference $1000$ in python. Write a function $($ name it welcome$\_$message$)$ to display welcome message. Write a function $($ name it menu$\_$message$)$ to display the menu $0$ for exit, $1$ for withdraw, $2$ for deposit, $3$ for balance inquiry. Write a function $($name it withdraw$)$ that will prompt the user to enter the amount to withdraw$($ assign to global variable$).$ The function will reduce balance by the amount entered if the balance is greater than or equal to the amount entered or display insufficient funds otherwise. Write a function $($ name it deposit$)$ that will prompt the user to enter the amount to deposit$($ assign to global variable$).$ The function will increase the balance by the amount entered. Write a function $($ name it balance$\_$inquiry$)$ that will display balance using $2$ decimal places. Write a function $($ name it simulate$\_$atm$).$ The function will call the welcome$\_$message. The function uses a while loop to allow the ATM user to perform several transactions $($deposit$,$withdraw or balance inquiry$)$ until the user is ready to exit. Use the if statement involving$\_$name$\_==\text{'}\_$main$\_\text{'}$to call the simulate$\_$atm.