The final round in a mathematics quiz consists of 5 questions. The marking scheme is as follows: 5 points for every correct answer, -3 points for every incorrect answer, and 0 point for every question not answered.
a. What is the minimum score for the quiz?
b. What is the maximum score for the quiz?
c. Write a situation where a contestant scores 5 points for the quiz.
d. Write a situation where a contestant scores -1 point for the quiz.