Multiply by Using the Rule for the Square of a Binomial

Multiple Choice

Multiply by using the rule for the square of a binomial.
- $$\left( 9 x + \frac { 1 } { 9 } \right) ^ { 2 }$$

A) $81 x ^ { 2 } + x + \frac { 1 } { 81 }$
B) $81 x ^ { 2 } + 2 x + \frac { 1 } { 81 }$
C) $81 x ^ { 2 } + \frac { 1 } { 81 }$
D) $81 x ^ { 2 } + \frac { 2 } { 9 } x + \frac { 1 } { 81 }$