Which of these statements is/are true? (Select all that apply.) O If F(x) = f (x) . g(x), then F '(x) = f (x) . g'(x) + g(x) . f'(x) O If c is a constant, then d(@ = 0 dx O If F(x) = f (x) + g(x), then F '(x) = f '(x) +g'(x) O If k is a real number, then d(X ) = kyk-1 dx none of these O If F(x) = f (x) . g(x), then F '(x) = f '(x) . g'(x) O If c is a constant, then ( c . f ( x ) ) = c . d ( f ( x ) ) dx dx