This Directive lays down rules concerning:
(a) access to the activity of credit institutions and investment firms (collectively referred to as "institutions");
(b) supervisory powers and tools for the prudential supervision of insti tutions by competent authorities;
(c) the prudential supervision of institutions by competent authorities in a manner that is consistent with the rules set out in Regulation (EU) No 575/2013;
(d) publication requirements for competent authorities in the field of prudential regulation and supervision of institutions.