Which of the following pairs represents linkage isomers ?

Question

( A ) $[PtCl_2 (NH_3)_4] Br_2 $ and $[PtBr_2(NH_3)_4]Cl_2$
( B ) $[Cu(NH_3)_4] [Pt\;Cl_4]$ and $[Pt(NH_3)_4][CuCl_4]$
( C ) $[Pd (P\; Ph_3)_2 (NCS)_2]$ and $[Pd ( P\; Ph_3)_2 (SCN)_2]$
( D ) $[CO(NH_3)_5 NO_3] SO_4 $ and $[CO(NH_3)_5 SO_4] NO_3$