Simplify the Expression Without Using a Calculator $\log _ { 6 } \sqrt { \frac { 1 } { 216 } }$

Multiple Choice

Simplify the expression without using a calculator.
- $\log _ { 6 } \sqrt { \frac { 1 } { 216 } }$

A) $- \frac { 3 } { 2 }$
B) $- \frac { 2 } { 3 }$
C) $\frac { 3 } { 2 }$
D) $\frac { 2 } { 3 }$