Find the Function Value $f ( x ) = 4 ^ { x }$

Multiple Choice

Find the function value. If the result is irrational, round your answer to the nearest thousandth.
-Let $f ( x ) = 4 ^ { x }$ . Find $\left( \frac { 5 } { 2 } \right)$ .

A) 32
B) $1.741$
C) 10
D) 512