The RMS voltage (V-RMS) of a sinusoidal waveform is determined by multiplying the peak voltage value by 0.7071, which is the same as one divided by the square root of two ( 1/√2 ).
![V_(RMS)=V_(PK)*\frac{1}{\sqrt[]{2}}=V_(PK)*0.7071](https://img.qammunity.org/2023/formulas/mathematics/college/qe951bylfe2n8c0ldadk4flulfxxho0nhi.png)
The question provides that:

The peak voltage is at

Therefore, the peak voltage is given to be:

Hence, the RMS voltage is gotten to be:

The correct option is OPTION D.