Which of the following is the general electronic configuration of transition elements?
- A$(n - 1)d^{1 - 9} ns^{1 - 2}$
- B$(n - 1)d^{1 - 10} ns^{1 - 2}$
- C$(n - 1)d^{1 - 10} ns^1$
- D$(n - 1)d^{1 - 9} ns^2$
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