A circuit to verify Ohm's law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the circuit :
Option: 1 ammeter is always used in parallel and voltmeter is series
Option: 2 Both ammeter and voltmeter must be connected in parallel
Option: 3 ammeter is always connected in series and voltmeter in parallel
Option: 4 Both, ammeter and voltmeter must be connected in series