Find the Product $$( n - 9 ) ( n + 9 )$$

Multiple Choice

Find the product.
- $$( n - 9 ) ( n + 9 )$$

A) $n ^ { 2 } - 18$
B) $n ^ { 2 } - 81$
C) $n ^ { 2 } - 18 n - 81$
D) $n ^ { 2 } - 18 n + 81$