a b c or d

Compared to the function y = f(x), the function y = - 6f(x) can be described as the result of a reflection in the Select one: O a. y-axis with a horizontal stretch by a factor of 6 O b. y-axis with a vertical stretch by a factor of 6 O c. x axis with a horizontal stretch by a factor of 6 O d. x-axis with a vertical stretch by a factor of 6 Clear my choice