Which of the following statements is true for the $CsBr_3$ molecule?

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