EX 6.1 How many iterations will the following for loops execute? a. for (int i = 0; i < 20; i++) { } b. for (int i = 1; i 0; i--) { } e. for (int i = 1; f. for (int i = 1; i = i + 2) { } i < 20; i < 20; i = 2) { }