Find the Coordinates of the Other Endpoint of the Segment $\left( \frac { p + a } { 2 } , \frac { q - w } { 2 } \right)$

Multiple Choice

Find the coordinates of the other endpoint of the segment, given its midpoint and one endpoint.
-midpoint $\left( \frac { p + a } { 2 } , \frac { q - w } { 2 } \right)$ , endpoint $( p , q )$

A) $( a , - w )$
B) $\left( \frac { 3 p + a } { 4 } , \frac { 3 q - w } { 4 } \right)$
C) $( a , w )$
D) $\left( \frac { a } { 2 } , - \frac { w } { 2 } \right)$