Find the Value of the Logarithmic Expression $\log _ { 10 } \frac { 1 } { 10000 }$

Find the value of the logarithmic expression.
- $\log _ { 10 } \frac { 1 } { 10000 }$

A) $- 40$
B) 4
C) $- 4$
D) 10,000