Which of the Following Must Be True for the Microstates

Multiple Choice

Which of the following must be true for the microstates of a system?
I.The energy of each microstate equals the energy of the system.
II.The entropy of each microstate equals the entropy of the system.
III.The number of microstates equals the entropy of the system.

A) I only
B) II only
C) III only
D) I and III only
E) I, II, and III are all true.