Simplify the Expression $( \sqrt { 5 } + 3 ) ( \sqrt { 3 } + 5 )$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $( \sqrt { 5 } + 3 ) ( \sqrt { 3 } + 5 )$

A) $\sqrt { 15 } + 15$
B) $\sqrt { 15 } + 8 \sqrt { 3 } + 15$
C) $9 \sqrt { 15 } + 15$
D) $\sqrt { 15 } + 5 \sqrt { 5 } + 3 \sqrt { 3 } + 15$