Which of the following statements is correct for $CsBr_3$?

• A
  It is a covalent compound
• B
  It contains $Cs^{3+}$ and $Br^{-}$ ions
• C
  It contains $Cs^{+}$ and $Br_3^-$ ions
• D
  It contains $Cs^{+}, Br^{-}$,and lattice $Br_2$ molecule