An octahedral complex having molecular compo sition \(Co.5NH_3.Cl.SO_4\) has two isomers A & B. The solution of A gives a white precipitate with \(BaCl_2\) solution, the type of isomerism exhibited by the complex is
(1) Linkage isomerism
(2) Geometrical isomerism
(3) Co-ordinate isomerism
(4) Ionization isomerism
