Representation of a company in agm

Suppose ABC Limited is a holding company of XYZ Limited. Mr D is the company secretary of ABC Limited. He has been authorized by ABC Limited to represent the Company in the Annual General Meeting of XYZ Limited.

Mr D is also a shareholder of XYZ Limited in his individual capacity. Now can he represent in AGM in both as in individual capacity and as a representative of ABC Limited or can he represent only in his individual capacity.

Please advice