Factor Out the Greatest Common Factor $16 m ^ { 2 } + 72 m + 81$

Multiple Choice

Factor out the greatest common factor. Then determine if the polynomial is a perfect square trinomial. If it is, factor it. $16 m ^ { 2 } + 72 m + 81$

A) $( 4 m - 9 ) ^ { 2 }$
B) $( 4 m + 9 ) ^ { 2 }$
C) $16 ( m + 9 ) ^ { 2 }$
D) Not a perfect square trinomial