Please help!

Given the graph of y = f(z) below, at which of the marked z-values can the following statements be true? (For each question, enter your answer as a comma-separated list, e.q., x1,x3,x5. Enter none if no points satisfy the given condition) (For each question, enter your answer as a comma-separated list, e.g., x1,x3,x5. Enter none if no points satisfy the given condition) A. f(x) > 0 at x = x1,x2.x5 B. f'(x) > 0 atx = x5,x1.x2 C. f(x) is increasing at x = x5.x1,x4 D. f' (x) is increasing at x = x5,x1.x4 E. The slope of f(x) is negative at & = x3 F. The slope of f'(a) is negative at a x4