If Possible, Factor the Polynomial Completely $$x ^ { 2 } - 12 x + 36$$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $$x ^ { 2 } - 12 x + 36$$

A) $( x - 6 ) ^ { 2 }$
B) $( x + 6 ) ^ { 2 }$
C) $( x - 12 ) ( x + 12 )$
D) $( x - 6 ) ( x + 6 )$