The oscillator circuit shown in the figure is has an ideal inverting amplifier. Its frequency of oscillation (in $\mathrm{Hz}$ ) is
- $\frac{1}{(2 \pi \sqrt{6} \mathrm{RC})}$
- $\frac{1}{(2 \pi \mathrm{RC})}$
- $\frac{1}{(\sqrt{6} \mathrm{RC})}$
- $\frac{1}{\sqrt{6}(2 \pi \mathrm{RC})}$