Find the Exact Value of the Expression $\cos ^ { - 1 } \left[ \cos \left( - \frac { 3 \pi } { 5 } \right) \right]$

Multiple Choice

Find the exact value of the expression. Do not use a calculator.
- $\cos ^ { - 1 } \left[ \cos \left( - \frac { 3 \pi } { 5 } \right) \right]$

A) $- \frac { 3 \pi } { 5 }$
B) $\frac { 2 \pi } { 5 }$
C) $\frac { 3 \pi } { 5 }$
D) $- \frac { 2 \pi } { 5 }$