Evaluate the Function $f ( x ) = \log _ { 4 } x$

Multiple Choice

Evaluate the function $f ( x ) = \log _ { 4 } x$ at $x = \frac { 1 } { 64 }$ without using a calculator.

A) $- 2$
B) $- 3$
C) $- 4$
D) 64
E) $\frac { 1 } { 64 }$