Evaluate the Square Root, If Possible, Without Using a Calculator $\sqrt { \frac { 1 } { 81 } }$

Multiple Choice

Evaluate the square root, if possible, without using a calculator. $\sqrt { \frac { 1 } { 81 } }$

A) $\frac { 1 } { 9 }$
B) $\frac { 1 } { 13 }$
C) $\frac { 1 } { 11 }$
D) $\frac { 1 } { 10 }$
E) not real