Multiply Using the Rule for Finding the Product of the Sum

Multiple Choice

Multiply using the rule for finding the product of the sum and difference of two terms.
- $$( x + 1 ) ( x - 1 )$$

A) $x ^ { 2 } - 2$
B) $x ^ { 2 } + 2 x - 1$
C) $x ^ { 2 } - 2 x - 1$
D) $x ^ { 2 } - 1$