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Which electronic configurations represent to a transition element?

(a) 1s2, 2s2 2p6, 3s23p63d10, 4s24p6

(b) 1s2, 2s2 2p6, 3s23p63d10, 4s24p1

(c) 1s2, 2s2 2p6, 3s23p63d10, 4s2

(d) 1s2, 2s2 2p6, 3s23p6, 4s2