Simplify the Expression $$11 \sqrt [ 3 ] { 3 } + 9 \sqrt [ 3 ] { 3 }$$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $$11 \sqrt [ 3 ] { 3 } + 9 \sqrt [ 3 ] { 3 }$$

A) $20 \sqrt [ 3 ] { 3 }$
B) $- 2 \sqrt [ 3 ] { 3 }$
C) $20 \sqrt [ 3 ] { 9 }$
D) $20 \sqrt [ 3 ] { 6 }$