Find the Positive Square Root of the Number $\frac { 1 } { 4 }$

Multiple Choice

Find the positive square root of the number $\frac { 1 } { 4 }$

A) $\frac { 1 } { 4 }$
B) impossible
C) $2$
D) $\frac { 1 } { 2 }$
E) $1$