Rationalize the Denominator and Simplify $\frac { 9 } { \sqrt { 17 } + 4 }$

Multiple Choice

Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
- $\frac { 9 } { \sqrt { 17 } + 4 }$

A) $9 \sqrt { 17 } + 36$
B) $9 \sqrt { 17 } - 4$
C) $9 \sqrt { 17 } - 36$
D) $\frac { 9 \sqrt { 17 } + 36 } { 34 }$