Factor the Following Perfect Square Trinomial $$x ^ { 2 } + 18 x + 81$$

Multiple Choice

Factor the following perfect square trinomial. $$x ^ { 2 } + 18 x + 81$$

A) $( x - 9 ) ^ { 2 }$
B) $( x + 8 ) ^ { 2 }$
C) $( x + 18 ) ^ { 2 }$
D) $( x + 9 ) ^ { 2 }$
E) none of these