5. Assume you have a function that accepts three inputs: a, b, and c. The number of valid and invalid equivalence classes for each input is given below. Input Variable Valid Equivalence Classes Invalid Equivalence Classes 4 3 2 a. How many test cases should be generated if Weak Normal Equivalence Class Testing was used? b. How many test cases should be generated if Strong Normal Equivalence Class Testing was used? c. How many test cases should be generated if Weak Robust Equivalence Class Testing was used? d. How many test cases should be generated if Strong Robust Equivalence Class Testing was used