Write two functions: a function named sum which takes two integer values as arguments, and returns their sum. a main function which asks the user for two integer values, passes the two values to the sum function, then prints the two values and their sum. the main function then again asks the user for two integer values, passes the two values to the sum function, then prints the two values and their sum.

Consider the following code snippet: #ifndef cashregister_h#define cashregister_hconst double max_balance = 6000000.0; class cashregister{public: cashregister(); cashregister(double new_balance); void set_balance(double new_balance); double get_balance() const; private: double balance[12]; }; double get_monthly_balance(cashregister bk, int month); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_balance should be removed since header files should not contain constants.c)the definition of cashregister should be removed since header files should not contain class definitions.d)the body of the get_monthly_balance function should be added to the header file.