Find the Exact Value of the Expression $- 1$ B) $- \sqrt { 3 }$

Multiple Choice

Find the exact value of the expression.
-cot 120°

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