Final answer:
When a multimeter is not being used, the selector switch should be in the high resistance position (option 1). This ensures that the multimeter does not interfere with the circuit being measured and provides accurate results.
Step-by-step explanation:
When a multimeter is not being used, the selector switch should be in the high resistance position (option 1).
A multimeter is a device used to measure various electrical quantities such as voltage, current, and resistance. The high resistance position ensures that the multimeter does not interfere with the circuit being measured and provides accurate results. It allows the multimeter to act as an open circuit, preventing current flow through the meter.