The Instantaneous Power Loss in a Circuit Containing Only a Resistor

Multiple Choice

The instantaneous power loss in a circuit containing only a resistor through which DC current flows is given by the formula P = I² R. To retain the form of this equation for the case of AC current, it is enough to

A) interpret P as average power.
B) interpret I as rms current.
C) The first two answers are valid and sufficient.
D) Both of the first two answers are necessary, but they are not sufficient.