The electrons which take part in order to exhibit variable oxidation states by transition metals...

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The electrons which take part in order to exhibit variable oxidation states by transition metals are :
\( P \)
(a) ns only
(b) \( (n-1) d \) only
(c) \( n s \) and \( (n-1) d \) only but not \( n p \)
(d) \( (n-1) d \) and \( n p \) only but not \( n s \)
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