Simplify the Expression $$\sqrt { 225 } + \sqrt { 81 }$$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $$\sqrt { 225 } + \sqrt { 81 }$$

A) 12
B) 24
C) $3 \sqrt { 34 }$
D) $2 \sqrt { 6 }$