When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This means
Options:
(a) input voltage cannot be AC voltage, but a DC voltage.
(b) maximum input voltage is 220V.
(c) the meter reads not v but and is calibrated to read < v2 > . and is calibrated to read
`sqrt v^2 `
(d) the pointer of the meter is stuck by some mechanical defect.