A. The processor shall implement appropriate technical and organizational measures for ensuring that, by default, only personal data which are necessary for each specific purpose of the processing are processed.
B. A processor shall not process those data except on instructions from the controller, unless required to do so by domestic law
C. Each processor and, where applicable, the processors representative shall maintain a record of all categories of processing activities earned out on behalf of a controller.
D. The processor shall consult the supervisory authority prior to processing where a data protection impact assessment indicates that the processing would result in a high risk in the absence of measures taken by the processor to mitigate the risk.
Explanation:
Article 29 of UK GDPR states that the processor and any person acting under the authority of the controller or of the processor, who has access to personal data, shall not process those data except on instructions from the controller, unless required to do so by domestic law. This means that the processor must follow the controller’s directions on how to handle the personal data, and cannot use it for its own purposes or deviate from the agreed terms. The only exception is when the processor is obliged by law to process the data in a different way, for example, to comply with a court order or a legal obligation. The other options are not related to Article 29, but to other articles of UK GDPR, such as Article 25 (data protection by design and by default), Article 30 (records of processing activities), and Article 36 (prior consultation).
Reference: Article 29 of UK GDPR1
ICO guidance on controllers and processors2