Which of the following pairs of complexes are isomeric with each their but their aqueous solutions exhibit different molar conductivities?

A. [ CoBr ( N H₃ )₅ SO4 and [ Co ( SO₄ ) ( NH₃ )₅ ] Br
B. [ CoCl₂ ( NH ₃ )₄ and [ CoCl ( NO₂ ) ( NH₃ )₄ ] Cl
C. [ PtCl₂ ( NH₃ )₄ Br and [ Pt Br₂ ( NH₃ )₄ ] C l
D. [ Co ( NO₂ ) ( NO₃ )₅ Cl₂ and [ Co ( ONO ) ( NH₃ ) 5 ] Cl₂