Find $f ( - x )$ ) and Determine Whether F Is Odd, Even, or Neither

Find $f ( - x )$ ) and determine whether f is odd, even, or neither.
- $$f ( x ) = 4 x ^ { 5 } - 5 x ^ { 4 }$$

A) $f ( - x ) = - 4 x ^ { 5 } + 5 x ^ { 4 } ; f$ is odd.
B) $f ( - x ) = - 4 x ^ { 5 } - 5 x ^ { 4 } ; f$ is neither odd nor even.
C) $f ( - x ) = 4 x ^ { 5 } + 5 x ^ { 4 } ; f$ is neither odd nor even.
D) $f ( - x ) = - 4 x ^ { 5 } - 5 x ^ { 4 }$ ; $f$ is even.