Find the Exact Value of the Expression $\cot 120 ^ { \circ }$

Multiple Choice

Find the exact value of the expression.
- $\cot 120 ^ { \circ }$

A) $- \frac { \sqrt { 3 } } { 3 }$
B) $- \sqrt { 3 }$
C) $- 1$
D) $\frac { \sqrt { 3 } } { 3 }$