The compound [Co(NH₃)₅Cl]SO₄ is isomeric with the compound [Co(NH₃)₅SO₄]Cl.
Which of the following rows correctly represents the oxidation state of cobalt in these compounds?

Rows [Co(NH₃)₅Cl]SO4 [Co(NH₃)₅SO4]Cl.
A +2 +3
B +3 +2
C +2 +1
D +3 +3