Which of the Following Correctly Declares an Enumerated Data Type

Which of the following correctly declares an enumerated data type named student?

A) enum student { Bill, Tom, Mary };
B) enum student { "Bill", "Tom", "Mary" };
C) int Bill = 1, Tom = 2, Mary = 3; enum student { 1, 2, 3 };
D) Any of the above 3 methods will work.
E) None of the above 3 methods will work.