8. The oxidation and coordination numbers of cobalt (Co) in the compound K[Co(C2O4)2(H2O)2] (where 617b49e4b8f4d.jpg = oxalate), respectively:
(A) 3 and 6
(B) 3 and 4
(C) -1 and 4
(D) -1 and 6
(E) none of these

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