Which of the following is NOT true?

A) 4 x 1/2 = 4/1 x 1/2

B) 1/2 divide 4 = 1/2 x 1/4

C) 4 divide 1/2 = 4 x 2

D) 1/2 divide 4 = 1/2 x 4/1

Please help!! :/