The process of stepping up or stepping down of voltage can be done with

alternating voltage

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direct voltage only

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both alternating and direct voltage

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neither alternating nor direct voltage

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Solution

The correct option is B alternating voltage
The process of stepping up and stepping down is done by a transformer. It is a device, based on mutual induction, which can take place, when current in a coil changes and this causes the change in magnetic flux in other coil. This can be done by using an alternating voltage not by a direct voltage, therefore stepping up or down can be done with alternating voltage only.

Suggest Corrections

List I	List II
$a .$ Rectifier $b .$ Stabilizer $c .$ Transformer $d .$ Filter	$i .$ Used either for stepping up or stepping down the A.C. Voltage. $i i .$ Used to convert A.C. voltage into D.C. voltage. $i i i .$ Used to remove any ripple in the rectified output voltage. $i v .$ Used for constant output voltage even when the input voltage or load current change.