What is the condition for the below system to be critically damped?

A

$$R\sqrt{\frac{L}{C}} = 1$$

B

$$\frac{R}{2}\sqrt{\frac{L}{C}} = 1$$

C

$$\frac{1}{\sqrt{LC}} = 1$$

D

$$\frac{R}{2}\sqrt{\frac{C}{L}} = 1$$