1. In order to fulfil their duties under this Regulation, competent authorities shall have, in accordance with national law, at least the following supervisory and investigatory powers:

(a) to require issuers, offerors or persons asking for admission to trading on a regulated market to include in the prospectus supplementary information, where necessary for investor protection;

(b) to require issuers, offerors or persons asking for admission to trading on a regulated market, and the persons that control them or are controlled by them, to provide information and documents;

(c) to require auditors and managers of the issuer, offeror or person asking for admission to trading on a regulated market, as well as financial intermediaries commissioned to carry out the offer of securities to the public or ask for admission to trading on a regulated market, to provide information;