Suppose that $$f(x) = x^3 - 3 x^2 + 1.$$

(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 interval notation to indicate where $f(x)$ is decreasing.
Decreasing:

(C) 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 $x$ =

(D) 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 $x$ =