a. An electrical manufacturer tests five generators by measuring their output voltages at three different times. Write a C++ program that uses a nested loop to enter each generator's test results, and then computes and displays the average voltage for each generator. Assume the following generator test results:
1st generator: 122.5 122.7 123.0
2nd generator: 120.2 127.0 125.1
3rd generator: 121.7 124.9 126.0
4th generator: 122.9 123.8 126.7
5th generator: 121.5 124.7 122.6
b. Modify the program written for Exercise 3a to calculate and display the average voltage for all the generators.