How do I solve this?

Question

Let f be a differentiable function with a domain of (0,5). It is known that f'(x) is negative on the intervals (0,1) and (2,3) and positive on the intervals (1,2) and (3,5). Which of the following statements is true?

a. f has no relative minima and three relative maxima

b. f has one relative minima and two relative maxima

c. f has two relative minima and one relative maxima

d. f has three relative minima and no relative maxima

Answer 1

C. 2 relative minimums and 1 relative maximum