If f(x) is differentiable for the closed interval [-3, 2] such that f(-3) = 4 and f(2) = 4, then there exists a value c, -3 < c < 2 such that....Select one:
a. f(c) = 0
b. f '(c) = 0
c. f (c) = 5
d. f '(c) = 5