Solve the Equation by Using the Square Root Property or Completing

Multiple Choice

Solve the equation by using the square root property or completing the square.
- $\mathrm{y}^{2}=12$

A) $\{144\}$
B) $\{6\}$
C) $\{2 \sqrt{3},-2 \sqrt{3}\}$
D) $\{\sqrt{12}\}$