Simplify the Expression $( \sqrt { 6 } + 4 ) ( \sqrt { 6 } - 4 )$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $( \sqrt { 6 } + 4 ) ( \sqrt { 6 } - 4 )$

A) $6 - 2 \sqrt { 4 }$
B) $- 10$
C) 2
D) 22