Multiply by Using the Rule for the Square of a Binomial

Multiply by using the rule for the square of a binomial.
- $$( x + 6 ) ^ { 2 }$$

A) $x ^ { 2 } + 36$
B) $x + 36$
C) $36 x ^ { 2 } + 12 x + 36$
D) $x ^ { 2 } + 12 x + 36$