Mashaal Masha
The surface area of a cube is $6\left(\dfrac{a}{4}\right)^{2}$, where $a$ is a positive constant. Which of the following gives the perimeter of one face of the cube?
A: 

$\dfrac{a}{4}$

B: 

$a$

C: 

$4a$

D: 

$6a$

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