If a System Undergoes a Reversible Process

Multiple Choice

If a system undergoes a reversible process,

A) it must be possible to restore the system to its original state.
B) it must be possible to restore the surroundings to their original state.
C) it must be possible to restore both the system and the surroundings to their original states.
D) it is impossible to restore either the the system or the surroundings to their original states.
E) the system must not interact with its surroundings.