Which of the Following Statements Concerning the Pauli Exclusion Principle

Multiple Choice

Which of the following statements concerning the Pauli exclusion principle is/are CORRECT?
1.If two electrons occupy the same orbital they must have opposite spins.
2.No two electrons in an atom can have the same four quantum numbers.
3.Electrons with opposing spins are attracted to each other.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1, 2, and 3