Which answer is the solution set of -4 ≤ 3 - y over the whole numbers? a. {6, 7, 8, 9, } b. {0, 1, 2, 3, 4, 5, 6} c. {7, 8, 9, } d. {0, 1, 2, 3, 4, 5, 6, 7}