File I/O in C: Open, Read, Write & Close file with Examples

In C write:(a) A function openFile that prompts a user to enter a file name and opens it.(b) A function closeFile that closes an open file.(c) A function getData that reads from the file the student names and their list of grades received and returns 2 separate arrays corresponding to their names and averages.(d) A function classAvg that takes as its parameter an array of student averages and returns the class average.(e) A function display that displays the student names, their averages, and