What Is the Domain of the Function $y = \left( \frac { 1 } { 8 } \right) ^ { x }$

Multiple Choice

What is the domain of the function $y = \left( \frac { 1 } { 8 } \right) ^ { x }$ ?

A) $$( -\infty , \infty )$$

B) $( 0 , \infty )$
C) $( \infty , 0 )$
D) $[ 0 , \infty )$