Find the Square Root $\sqrt { \frac { 49 } { 400 } }$

Multiple Choice

Find the square root. Assume that all variables represent positive real numbers.
- $\sqrt { \frac { 49 } { 400 } }$

A) $\frac { 1 } { 3 }$
B) $\frac { 2 } { 5 }$
C) $\frac { 7 } { 20 }$
D) $\frac { 3 } { 25 }$