Given below are some of the statements about Mn and $\mathrm{Mn}_{2} \mathrm{O}_{7}$. Identify the correct statements A. Mn forms the oxide $\mathrm{Mn}_{2} \mathrm{O}_{7}$ in which Mn is in its highest oxidation state. B. Oxygen stabilizes the Mn in higher oxidation states by forming multiple bonds with Mn C. $\mathrm{Mn}_{2} \mathrm{O}_{7}$ is an ionic oxide. D. The structure of $\mathrm{Mn}_{2} \mathrm{O}_{7}$ consists of one bridged oxygen. Choose the correct answer from the options given below: