Describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x). f(x) = cos x/2 ; g(x) = cos x (1 point) Select one: a. Horizontal stretch by a factor of 2 b. Vertical stretch by a factor of 2 c. Vertical shrink by a factor of 1/2 d. Horizontal shrink by a factor of 1/2