Compute the Exact Value of the Function for the Given $f ( x ) = \left( \frac { 1 } { 3 } \right) ^ { x }$

Multiple Choice

Compute the exact value of the function for the given x-value without using a calculator.
- $f ( x ) = \left( \frac { 1 } { 3 } \right) ^ { x }$ for $x = 2$

A) $\frac { 1 } { 9 }$
B) $\frac { 1 } { 8 }$
C) 9
D) $\frac { 1 } { 6 }$