a. Briefly explain 3 advantages of using input/output files in programming. (3 marks) b. Write C++ statements that allow you to enter 50 employees data that consists of an staf ID, name and their monthly total sales. If the total sales is at least RM100,000.00, write each record into a file named excellent Staff.txt. The purpose of the file is to store staff records with good sales performance. If not, write each record into a file named workshopStaff.txt for the purpose of storing the records for staff that will be joining for the future workshop on sales strategies. (5 marks)