Let f be a function defined and continuous on the closed

Last updated: 8/12/2022

Let f be a function defined and continuous on the closed interval [a,b]. Iff has a relative maximum at c and a<c<b, which of the following statements must be true? I. f'(c) exists. II. If f'(c) exists, then f'(c) = 0. IH. If "(c) exists, then f"(c) ≤0. OA) II only B) III only OC) I and II only OD) I and III only OE) II and III only