Which one of the following represents an acceptable possible set of quantum numbers (in the order n, l, me, mg) for an electron in an atom? Select one: a. 2,0,1. -1/2 b. 2,1,0,0 c. 2, 2, 0, 1/2 d. 2, 0, 2, +1/2 e. 2, 1,-1, 1/2