The requirement for a controller to document personal data breaches is mandated by Article 33(5) of the GDPR, not Article 30. Article 30 specifically outlines the requirements for maintaining Records of Processing Activities (RoPA). While documenting breaches is a critical GDPR obligation, it is a separate and distinct requirement from the RoPA. The RoPA serves as an inventory of data processing, whereas the breach log documents incidents and the response to them.

B. Data inventory or data mapping exercises that have been conducted. This is incorrect because the records required by Article 30 constitute the formal output of a data inventory or data mapping exercise. Therefore, maintaining these records is effectively a requirement to document the results of such exercises.
C. Categories of recipients to whom the personal data have been disclosed. This is incorrect as it is an explicit requirement listed under Article 30(1)(d) for the controller's records of processing activities.
D. Retention periods for erasure and deletion of categories of personal data. This is incorrect as it is an explicit requirement listed under Article 30(1)(f), which states records must include, "where possible, the envisaged time limits for erasure of the different categories of data." ---

1. Regulation (EU) 2016/679 (General Data Protection Regulation)

Article 30(1)(d) & (f): Specifies that the controller's records shall contain "the categories of recipients to whom the personal data have been or will be disclosed" and "where possible, the envisaged time limits for erasure of the different categories of data." This directly refutes options C and D.

Article 33(5): States, "The controller shall document any personal data breaches, comprising the facts relating to the personal data breach, its effects and the remedial action taken." This confirms that the requirement in option A exists but falls under a different article than the one specified in the question.

2. Information Commissioner's Office (ICO), UK. "Guide to the UK General Data Protection Regulation (UK GDPR), Documentation."

Section: Records of processing activities (Article 30): This section details the specific information that must be included in the RoPA, aligning with the text of Article 30 and confirming that options C and D are required. It describes the RoPA as the output of data mapping, making option B an implicit requirement.

Section: Logging and records of breaches (Article 33): This section is distinct from the Article 30 guidance and explicitly states, "You must document all breaches, regardless of whether or not you need to notify." This clearly separates the breach documentation requirement from the Article 30 RoPA.

3. European Data Protection Board (EDPB). "Guidelines 01/2021 on Examples regarding Data Breach Notification."

Page 6, Paragraph 13: "According to Article 33(5) GDPR, the controller has to document any personal data breaches... This documentation must be distinguished from the records of processing activities according to Article 30 GDPR." This official guidance explicitly distinguishes the two record-keeping obligations, confirming that the breach log (Option A) is not part of the Article 30 record.