Find the Function Value $\text { Let } f ( x ) = 4 ^ { x } \text {. Find } f ( 3 )$

Multiple Choice

Find the function value. If the result is irrational, round your answer to the nearest thousandth.
- $\text { Let } f ( x ) = 4 ^ { x } \text {. Find } f ( 3 )$

A) 12
B) 81
C) 256
D) 64