(a) If you combine two atomic orbitals on two different atoms to make a new orbital, is...

Question:

(a) If you combine two atomic orbitals on two different atoms to make a new orbital, is this a hybrid orbital or a molecular orbital?
(b) If you combine two atomic orbitals on one atom to make a new orbital, is this a hybrid orbital or a molecular orbital?
(c) Does the Pauli Exclusion Principle apply to MOs? Explain.