According to the Free CIPP/E Study Guide, page 12, "the GDPR requires data controllers to implement appropriate technical and organizational measures to ensure and to be able to demonstrate that processing is performed in accordance with the GDPR. These measures should take into account the nature, scope, context and purposes of processing as well as the risks of varying likelihood and severity for the rights and freedoms of natural persons." The GDPR also requires data controllers to ensure the security of personal data, to notify data breaches to the supervisory authorities and data subjects, and to cooperate with the supervisory authorities in providing any information necessary for the performance of their tasks. Therefore, the GDPR requirement that data controllers must be in control of the data they hold at all times will present the most significant challenges for organizations with BYOD programs, as they will have to deal with the increased risks of data loss, theft, unauthorized access, or misuse that may arise from the use of personal devices by employees or contractors. The other options are not necessarily more challenging for organizations with BYOD programs, although they may involve other obligations under the GDPR, such as obtaining a valid legal basis, providing adequate safeguards, or informing the data subjects. Reference:
Free CIPP/E Study Guide, page 12
GDPR, Articles 24, 25, 28, 32, 33, 34 and 58