If Possible, Factor the Polynomial Completely $$49 x ^ { 2 } - 56 x y + 16 y ^ { 2 }$$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $$49 x ^ { 2 } - 56 x y + 16 y ^ { 2 }$$

A) $( 7 x - 4 y ) ^ { 2 }$
B) $( 7 x + 4 y ) ^ { 2 }$
C) $( 49 x + 1 ) ( x + 16 )$
D) $( 7 x - 4 y ) ( 7 x + 4 y )$