The complex which has facial and meridional isomers is (Given : py = pyridine and en = H2N-CH2-CH2-NH2 )

1. A. [Cr(py)3(Cl)3]
2. B. [Cr(H2O)6] 3+
3. C. [Co(NH3)4(H2O)2] 3+
4. D. [Ni(en)2(H2O)2] 2+

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