Electrons should be filled in energy sub shells in order of increasing energy values, is principle of

Electrons should be filled in energy sub shells in order of increasing

1.	Electrons should be filled in energy sub shells in order of increasing energy values, is principle of
A.	Aufbau
B.	Pauli's exclusion
C.	Hund's
D.	none of these
Answer» B. Pauli's exclusion