State Whether the Function Is a Polynomial Function or Not $f ( x ) = \frac { 2 - x ^ { 4 } } { 9 }$

Multiple Choice

State whether the function is a polynomial function or not. If it is, give its degree. If it is not, tell why not.
- $f ( x ) = \frac { 2 - x ^ { 4 } } { 9 }$

A) Yes; degree 1
B) No; x is a negative term
C) No; it is a ratio
D) Yes; degree 4