Suppose $f(x) = 4x^{3}-9x$.

(a) Then $f(-x) =$ help (formulas) You must simplify your answer as much as possible.

(b) For all $x$, $f(-x) =$
A. $f(x)$
B. $-f(x)$
C. None of the above

(c) Is $f$ an even function, an odd function, or neither even nor odd.
A. Even
B. Odd
C. Neither