In an LCR circuit, which of the following expression has the dimension of frequency:

$\sqrt{\frac{L}{C}}$ $\frac{C}{R}$ $\frac{1}{\sqrt{RC}}$ $\frac{1}{\sqrt{LC}}$

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

The correct answer is Option (4) → $\frac{1}{\sqrt{LC}}$