The prime factorizations of 16 and 24 are shown below. Prime factorization of 16: 2, 2, 2,2
Prime factorization of 24: 2, 2, 2, 3

Using the prime factorizations, what is the greatest common factor of 16 and 24?

(A) 2
(B) 2 ` 2
(C) 2 ` 2 ` 2
(D) 2 ` 2 ` 2 ` 2 ` 3​