JEE Main 2019 Chemistry question

A reaction of cobalt(III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured) and B (green coloured). A can show optical activity, but B is optically inactive. What type of isomers does A and B represent?

• (A)Ionisation isomers
• (B)Linkage isomers
• (C)Coordination isomers
• (D)Geometrical isomersCorrect