Find the Exact Value of the Expression $\sin ^ { - 1 } ( 1 )$

Multiple Choice

Find the exact value of the expression.
- $\sin ^ { - 1 } ( 1 )$

A) $\frac { \pi } { 2 }$
B) $\frac { \pi } { 4 }$
C) $\frac { \pi } { 3 }$
D) $\pi$