Find the Exact Value of the Composition $\arccos [ \sin ( \pi / 6 ) ]$

Multiple Choice

Find the exact value of the composition.
- $\arccos [ \sin ( \pi / 6 ) ]$

A) $\frac { \pi } { 3 }$
B) $\frac { 1 } { 2 }$
C) $\frac { \pi } { 6 }$
D) $\frac { \sqrt { 3 } } { 2 }$