88In support of his action, the applicant raises four pleas in law, alleging:– first, breach of the rights of the defence, the right to good administration, the right to be heard and the principle of proportionality;– second, breach of the principles of the presumption of innocence and impartiality;– third, breach of the principles of non-retroactivity and legal certainty and the principle that penalties must have a proper legal basis;– fourth, breach of the ‘principle of the confidentiality of disciplinary proceedings and judicial investigations’, Article 10(2) of Regulation No 883/2013 and Article 4(1) of Regulation (EU) 2018/1725 of the European Parliament and of the Council of 23 October 2018 on the protection of natural persons with regard to the processing of personal data by the Union institutions, bodies, offices and agencies and on the free movement of such data, and repealing Regulation (EC) No 45/2001 and Decision No 1247/2002/EC (OJ 2018 L 295, p. 39).