According to the Aufbau principle, what are the values of principal quantum number ( n ) and angular momentum quantum number ( l ) for the sub-level that is filled AFTER the 4s orbital?
A. n = 3, l = 2
B. n = 4, l = 2
C. n = 4, l = 1
D. n = 3, l = 1
E. n = 5, l = 0
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