4. The Commission shall be empowered to adopt delegated acts in accordance with Article -8a concerning (a) detailed criteria establishing the amount of the fine; (b) detailed rules on the procedure for the investigations referred to in paragraph 3, associated measures and reporting on the investigations, as well as detailed rules of procedure aimed at guaranteeing the rights of defence, access to file, legal representation, confidentiality and temporal provisions and the collection of fines.
(b) bijzondere regels inzake de procedure voor de in lid 3 genoemde onderzoeken, bijhorende maatregelen en rapportage over de onderzoeken, alsmede bijzondere procedureregels ter waarborging van de rechten op verdediging, toegang tot dossiers, wettige vertegenwoordiging, vertrouwelijkheid en tijdelijke bepalingen en de inning van boeten.