Which among the following will be named as dibromobis(ethylene diamine)chromium(III) bromide?

A

$$[Cr(en)_3]Br_3$$

B

$$[Cr(en)_2 Br_2]Br$$

C

$$[Cr(en)Br_4]^-$$

D

$$[Cr(en)Br_2]Br$$