(4)The ECB carries out its supervisory tasks within the SSM, which should ensure that the Union's policy relating to the prudential supervision of credit institutions is implemented in a coherent and effective manner, that the single rulebook for financial services is applied in the same manner to credit institutions in all Member States concerned, and that those credit institutions are subject to supervision of the highest quality. In carrying out its supervisory tasks, the ECB should have full regard to the diversity of credit institutions and their size and business models, as well as the systemic benefits of diversity in the Union's banking industry.