Factor Out the Greatest Common Factor $32 r ^ { 2 } - 16 r s + 2 s ^ { 2 }$

Multiple Choice

Factor out the greatest common factor. Then determine if the polynomial is a perfect square trinomial. If it is, factor it. $32 r ^ { 2 } - 16 r s + 2 s ^ { 2 }$

A) $2 ( 4 r - s ) ( 4 r + s )$
B) $2 ( 4 r - s ) ^ { 2 }$
C) $32 r ^ { 2 } - 16 r s + 2 s ^ { 2 }$ ; Not a perfect square trinomial
D) $2 \left( 16 r ^ { 2 } - 8 r s + s ^ { 2 } \right)$ ; Not a perfect square trinomial