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Which is/are not correct configuration of s–block elements : (A) (Ar) 3d^10 4s^2 (B) (Ar) 3d^10 4s^1 (C) (Ar) 4s^2

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Which is/are not correct configuration of s–block elements : 

(A) (Ar) 3d10 4s2 

(B) (Ar) 3d10 4s1 

(C) (Ar) 4s2 

(D) (Ar) 4s1

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(A) (Ar) 3d10 4s2

(B) (Ar) 3d10 4s1

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