3. let f: (a, b) -> r be a twice differentiable function satisfying f" <0. then the number of zeros f can have (a) 1 (b) 2 (c) 3 a (d) las

3. Let f: (a, b) -> R be a twice differentiable function satisfying f" <0. Then the number of zeros f can have (a) 1 (b) 2 (c) 3 A (d) las