Evaluate the Function at the Indicated Value of X $f ( x ) = 4 ^ { x }$

Multiple Choice

Evaluate the function at the indicated value of x.Round your result to three decimal places. ​
Function
Value $f ( x ) = 4 ^ { x }$ $x = - \pi$ ​

A) $1.513$
B) $0.013$
C) $0.513$
D) ​ $0.121$
E) $2.0129$