In the case of a charged conductor, what is the character of the conductor?

A、Differentregionsinsidetheconductormaybeatdifferentpotentials.;
B、Differentregionsinsidetheconductormayhavedifferentelectricfields.;
C、Thepotentialmustbezeroeverywhereinsidetheconductor.;
D、Theelectricfieldmustbezeroeverywhereinsidetheconductor.