Sketching Graphs of Functions and Derivatives Practice Test

$f'$ is zero at $x=-3,1$ and positive everywhere else.

$f'$ has no zeros and stays negative for all $x$.

$f'$ is zero only at $x=-3$ and changes sign there.

$f'$ crosses from positive to negative at $x=-3$ and from negative to positive at $x=1$.

$f'$ crosses from negative to positive at $x=-3$ and from positive to negative at $x=1$.