Evaluate the Given Function $$f ( x ) = x ^ { 4 } , f \left( b ^ { 5 } \right)$$

Multiple Choice

Evaluate the given function.
- $$f ( x ) = x ^ { 4 } , f \left( b ^ { 5 } \right)$$

A) $b ^ { 9 }$
B) 20
C) $b ^ { 20 }$
D) $x ^ { 4 } b ^ { 5 }$