Which of the following electron has minimum energy?

(A) n = 3, l = 2, m = –2, s = +1/2

(B) n = 4, l= 0,  m = 0, s = +1/2

(C) n = 4, l= 1, m = +1, s = +1/2

(D) n = 5, l = 0, m = 0, s = + 1/2

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