Rationalize the Denominator $\frac { 4 } { \sqrt { 7 } }$

Multiple Choice

Rationalize the denominator. Assume all variables represent positive real numbers.
- $\frac { 4 } { \sqrt { 7 } }$

A) $\frac { 16 \sqrt { 7 } } { 7 }$
B) $4 \sqrt { 7 }$
C) $\frac { 4 \sqrt { 7 } } { 7 }$
D) 53