What are all of the factors of 84? A 1, 2, 4, 21, 42, 84 B 1, 2, 3, 4, 21, 28, 42, 84 C 1, 2, 3, 4, 6, 14, 21, 28, 42, 84 D 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84