The number of stereoisomers is maximum for (ox = $$\text{C}_2\text{O}_4^{2-}$$)

A

$$[\text{Co}(\text{ox})_3]^{3-}$$

B

$$[\text{Co}(\text{ox})_2\text{ClBr}]^{3-}$$

C

$$[\text{Co}(\text{ox})\text{Cl}_2\text{Br}_2]^{3-}$$

D

$$[\text{CoCl}_3\text{Br}_3]^{3-}$$