C# Computer-Assisted Instruction: Reducing Student Fatigue) One problem in CAI environments is student fatigue. This can be reduced by varying the computers responses to hold the students attention. Modify the program of Exercise 7.39 so that various comments are displayed for each answer. Possible responses to a correct answer:

Possible responses to an incorrect answer:

Use random-number generation to choose a number from 1 to 4 that will be used to select one of the four appropriate responses to each correct or incorrect answer. Use a switch statement to issue the responses.