Find the Specified Quantity $y = 4 - 2 \sin \left( 3 x + \frac { \pi } { 2 } \right)$

Multiple Choice

Find the specified quantity.
-Find the phase shift of $y = 4 - 2 \sin \left( 3 x + \frac { \pi } { 2 } \right)$

A) $- \frac { \pi } { 6 }$
B) $- \frac { \pi } { 2 }$
C) $\frac { \pi } { 6 }$
D) $\frac { \pi } { 4 }$