Which of the following statements is true regarding the structure of $Cr_2O_7^{2-}$?
- AIt does not contain $Cr-Cr$ and $O-O$ bonds.
- BIt contains one $Cr-Cr$ bond and six $O-O$ bonds.
- CIt contains no $Cr-Cr$ bond and six $O-O$ bonds.
- DIt contains one $Cr-Cr$ bond and seven $Cr-O$ bonds.
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