Which of the following statements are TRUE? 1. If f' > 0 on the interval (a, b) , then the graph of f is concave up on the interval (a, b). 11. If the graph of f is increasing on the interval (a, b) , then f" > 0 on the interval (a, b) . Ill. The Second Derivative Test is used to determine the relative extrema of a function. O None of them O Il only O ll and Ill only O I and Ill only O I only O Ill only O I, II, and III I and Il only