// Q3b: Define Friend Function changeSalary() (3 points) // Define the function changeSalary()that is declared in employee. h file. // This function sets the new 'salary' of the employee. The employee object and new salary is to be passed as function arguments. // Use 'd' display option after using 'c' option to verify. // You will need to implement add() and displayList() before you test this function.