Find the Exact Value of the Logarithmic Expression $\log _ { 9 } \frac { 1 } { 729 }$

Multiple Choice

Find the exact value of the logarithmic expression.
- $\log _ { 9 } \frac { 1 } { 729 }$

A) 3
B) $- 81$
C) 81
D) $- 3$