Perform the Indicated Operation $( \sqrt { 6 } - 3 ) ( \sqrt { 5 } - 6 )$

Multiple Choice

Perform the indicated operation. Assume that all variables represent positive real numbers.
- $( \sqrt { 6 } - 3 ) ( \sqrt { 5 } - 6 )$

A) $\sqrt { 30 } + 18$
B) $\sqrt { 30 } - 6 \sqrt { 6 } - 3 \sqrt { 5 } + 18$
C) $- 8 \sqrt { 30 } + 18$
D) $\sqrt { 30 } - 9 \sqrt { 5 } + 18$