Evaluate the Function at the Indicated Value Of $x = 64$

Multiple Choice

Evaluate the function at the indicated value of $x = 64$ . $f ( x ) = \log _ { 8 } x$

A) 0
B) $- \frac { 1 } { 2 }$
C) $\frac { 1 } { 2 }$
D) -2
E) 2