What type of current flow is opposed by resistance?

Resistance is a fundamental property of a material that opposes the flow of electric charge. It behaves similarly to friction in a mechanical system, converting electrical energy into heat. Because resistance depends on the physical characteristics of the material (like a wire or a carbon resistor) rather than the type of signal, it opposes all forms of electrical current. Whether the circuit carries direct current (DC) from a battery, alternating current (AC) from a wall outlet, or radio frequency (RF) current from a transmitter, resistance will impede the electron flow. Therefore, all the listed choices are correct.