(a) nature of the personal data breach including where possible, the categories and approximate  number of data subjects concerned and the categories and approximate number of personal  data records concerned;  (b) likely consequences of the breach;  (c) measures taken or proposed to be taken to address the breach, including, where appropriate,  measures to mitigate its possible adverse effects.  The contractor shall immediately inform the data controller if, in its opinion, an instruction infringes  Regulation (EU) 2018/1725, Regulation (EU) 2016/679, or other Union or Member State data  protection provisions as referred to in the tender specifications.  The contractor shall assist the controller for the fulfilment of its obligations pursuant to Article 33 to  41 under Regulation (EU) 2018/1725 to:  (a) ensure compliance with its data protection obligations regarding the security of the processing,  and the confidentiality of electronic communications and directories of users; (b) notify a personal data breach to the European Data Protection Supervisor;  (c) communicate a personal data breach without undue delay to the data subject, where  applicable;  (d) carry out data protection impact assessments and prior consultations as necessary.  The contractor shall maintain a record of all data processing operations carried on behalf of the  controller, transfers of personal data, security breaches, responses to requests for exercising rights of  people whose personal data is processed and requests for access to personal data by third parties.  The contracting authority is subject to Protocol 7 of the Treaty on the Functioning of the European  Union on the privileges and immunities of the European Union, particularly as regards the inviolability  of archives (including the physical location of data and services as set out in Article I.9.2) and data  security, which includes personal data held on behalf of the contracting authority in the premises of  the contractor or subcontractor.  The contractor shall notify the contracting authority without delay of any legally binding request for  disclosure of the personal data processed on behalf of the contracting authority made by any national  public authority, including an authority from a third country. The contractor may not give such access  without the prior written authorisation of the contracting authority.  The duration of processing of personal data by the contractor will not exceed the period referred to in  Article II.24.2. Upon expiry of this period, the contractor shall, at the choice of the controller, return,  without any undue delay in a commonly agreed format, all personal data processed on behalf of the  controller and the copies thereof or shall effectively delete all personal data unless Union or national  law requires a longer storage of personal data. For the purpose of Article II.10, if part or all of the processing of personal data is subcontracted to a  third party, the contractor shall pass on the obligations referred to in Articles I.9.2 and II.9.2 in writing  to those parties, including subcontractors. At the request of the contracting authority, the contractor  shall provide a document providing evidence of this commitment. II.10 SUBCONTRACTING  II.10.1  The contractor must not subcontract and have the contract performed by third parties  beyond the third parties already mentioned in its tender without prior written authorisation  from the contracting authority.  22 