The Graph of a Function F Is Given $f$ Has a Local Minimum At

Multiple Choice

The graph of a function f is given. Use the graph to answer the question.
-Find the numbers, if any, at which f has a local minimum. What are the local minima? A) $f$ has a local minimum at $x = - \pi$ ; the local minimum is $- 1$
B) $f$ has a local minimum at $x = 0$ ; the local minimum is 1
C) $f$ has a local minimum at $x = - \pi$ and $\pi$ ; the local minimum is $- 1$
D) f has no local minimum