Which of the following are the mandatory pieces of information to be included in the...

 Copies of the consent forms from each data subject (A): This is not a mandatory piece of information for the documentation of processing activities. Reference: GDPR Article 30.

 Time limits for erasure of different categories of data (B): This is mandatory as per GDPR requirements to ensure that data is not kept longer than necessary. Reference: GDPR Article 30.

 Contact details of the processor and Data Protection Officer (DPO) (C): The GDPR mandates that the records of processing activities must include the contact details of the processor and the DPO. Reference: GDPR Article 30(2)(a).

 Descriptions of the processing activities and relevant data subjects (D): This is mandatory to provide a clear understanding of what data is being processed and for whom. Reference: GDPR Article 30(1)(b).