Which statement is correct about the transformation of a function f(x)?
a.By moving f(x) k units down, you obtain the function f(x)+k.
b.By moving f(x) k units to the right, you obtain the function f(x−k).
c.By shrinking f(x) k units horizontally, you obtain the function 1kf(x).
d.By stretching f(x) k units vertically, you obtain the function f(kx).