When a voltage measuring device is connected to \( \mathrm{AC} \) m...

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When a voltage measuring device is connected to \( \mathrm{AC} \) mains, the meter shows the steady input voltage of \( 220 \mathrm{~V} \). This means
\( \mathrm{P} \)
(a) input voltage cannot be AC voltage, but a DC voltage.
W
(b) maximum input voltage is \( 220 \mathrm{~V} \).
(c) the meter reads not \( v \) but \( \left\langle v^{2}\right\rangle \) and is calibrated to read \( \sqrt{v^{2}} \).
(d) the pointer of the meter is stuck by some mechanical defect.
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