Select the correct statement about the complex $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}$

• A

  Its ionisation isomer is $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4$.
• B

  It gives yellow precipitate with $\mathrm{AgNO}_3$.
• C

  Its ionisation isomer give while precipitate with $\mathrm{BaCl}_2$
• Correct answer
  D

  All the above are correct statements.

Hence, the correct answer is option: 'D'.