Factor the Polynomial $$z ^ { 2 } + 6 z + 9$$

Multiple Choice

Factor the polynomial. $$z ^ { 2 } + 6 z + 9$$

A) $( z - 3 ) ^ { 2 }$
B) $( z + 3 ) ^ { 2 }$
C) $( z + 3 ) ( z - 3 )$
D) $( z + 3 ) ( z + 3 )$
E) none of these