Which of the following statements is true about measuring resistance?

Measuring resistance correctly necessitates removing power from the circuit before taking the measurement. When power is present, it can lead to inaccurate readings and potentially damage the multimeter, as it is not designed to measure resistance while voltage is applied. Moreover, measuring resistance under powered conditions might influence the circuit's behavior, leading to misleading results.

Disconnecting power ensures safety and allows for precise resistance measurements without the interference of voltage or current flow. This practice helps in avoiding accidental shorts and further complications in electrical systems.

The other options suggest various incorrect procedures or misunderstandings about measuring resistance. For instance, measuring resistance with power on can harm the meter and the circuit. Simply connecting the meter without considering the circuit state could yield incorrect values, and resistance measurements typically do require specific settings on the meter for accuracy.