Which of the following sets of quantum numbers represents the highest energy level in an atom?

(a) n = 3, l = 1, m = 1, s = +1/2
(b) n = 3, l = 2, m = 1, s = +1/2
(c) n = 4, l = 0, m = 0, s = +1/2
(d) n = 3, l = 0, m = 0, s = +1/2