RMS of sine wave equals to

Correct option is A

​$$V_{\text{rms}} = \frac{V_m}{\sqrt{2}} = 0.707 V_{\text{max}} \text{ V} \\I_{\text{rms}} = \frac{I_{\text{max}}}{\sqrt{2}} = 0.707 I_{\text{max}}$$​​