Factor the Trinomial, If Possible $$16 a ^ { 2 } + 32 a b + 16 b ^ { 2 }$$

Multiple Choice

Factor the trinomial, if possible.
- $$16 a ^ { 2 } + 32 a b + 16 b ^ { 2 }$$

A) $16 ( a + b ) ^ { 2 }$
B) $( 4 a - 4 b ) ^ { 2 }$
C) $16 ( a - b ) ^ { 2 }$
D) $( 4 a + 4 b ) ^ { 2 }$