Find the Square Root $\sqrt { \frac { 441 } { 64 } }$

Multiple Choice

Find the square root. Assume that all variables represent nonnegative real numbers.
- $\sqrt { \frac { 441 } { 64 } }$

A) $\frac { 55 } { 8 }$
B) $\frac { 7 } { 3 }$
C) $\frac { 11 } { 4 }$
D) $\frac { 21 } { 8 }$