What important safety precaution must be observed when measuring resistance in an electronic circuit? A. All power to the component under test must be disconnected. B. The red test lead must be at the

What important safety precaution must be observed when measuring resistance in an electronic circuit? A. All power to the component under test must be disconnected. B. The red test lead must be at the most positive point in the circuit. C. The black test lead must be connected to the chassis ground. D. The meter's highest resistance range setting should be used until the actual value is determined.