If Possible, Factor the Polynomial Completely $$36 x ^ { 2 } - 84 x + 49$$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $$36 x ^ { 2 } - 84 x + 49$$

A) $( 6 x - 7 ) ( 6 x + 7 )$
B) $( 36 x + 1 ) ( x + 49 )$
C) $( 6 x + 7 ) ^ { 2 }$
D) $( 6 x - 7 ) ^ { 2 }$