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In the coordination compound [Cr(NH3)2(en)Cl2]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are a. C.N. = 6, O.N. = +4 b. C.N. = 6, O.N. = +3 c. C.N. = 5, O.N. = +2 d. C.N. = 5, O.N. = +4 e. C.N. = 4, O.N. = +3