Problem 4 - 25 points a. Write a function fillArray() that takes as parameters an array of integers and its size. The function fills the array with random numbers between 120 and 200. b. Write a function average Even() that takes as parameters an array of integers and its size. The function returns the average of array elements that are even. c. Write a function oddAndPrime() that takes as parameters an array of integers and its size. The function prints on the screen the array elements that are odd and prime. d. Write a C++ program that tests the above functions