Suppose that

(A) Find all critical values of $f$. If there are no critical values, enter -1000. If there are more than one, enter them separated by commas.
Critical value(s) =

(B) Use the second derivative test to find the $x$-coordinates of all local maxima of $f$. If there are no local maxima, enter -1000. If there are more than one, enter them separated by commas.

Local maxima at $x$ =

(C) Use the second derivative test to find the $x$-coordinates of all local minima of $f$. If there are no local minima, enter -1000. If there are more than one, enter them separated by commas.

Local minima at $x$ =