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Which of the following is electronic configuration of `Cu^(2+) (Z = 29)` ?
A. `[Ar]4s^(1)3d^(8)`
B. `[Ar]4s^(1)3d^(10)4p^(1)`
C. `[Ar]4s^(1)3d^(10)`
D. `[Ar]3d^(9)`

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