Determine Whether the Function Is a Polynomial Function $$f ( x ) = \pi x ^ { 3 } - 2 x ^ { 2 } + 4$$

Determine whether the function is a polynomial function.
- $$f ( x ) = \pi x ^ { 3 } - 2 x ^ { 2 } + 4$$

A) 3
B) 2
C) $\pi$
D) 1