We Want to Change the BankAccount Class So That All

Multiple Choice

We want to change the BankAccount class so that all accounts will have a monthly fee. When a BankAccount is created, its monthly fee is set and cannot be changed. Which of the following will properly define the instance variable monthlyFee that holds the monthly fee?

A) monthlyFee: double;
B) instance var monthlyFee;
C) private double monthlyFee;
D) private field monthlyFee;