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

Multiple Choice

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

A) 4
B) 1
C) 3
D) $- 1$