Completely Factor the Polynomial or State That the Polynomial Is $$49 x ^ { 2 } - 126 x + 81$$

Multiple Choice

Completely factor the polynomial or state that the polynomial is prime.
- $$49 x ^ { 2 } - 126 x + 81$$

A) $( 7 x + 9 ) ( 7 x - 9 )$
B) $( 7 x - 9 ) ^ { 2 }$
C) $( 7 x + 9 ) ^ { 2 }$
D) $( 7 x - 10 ) ^ { 2 }$