Which of the following best describes the role of supervisory authorities under GDPR?

The role of supervisory authorities under the General Data Protection Regulation (GDPR) is primarily focused on ensuring compliance with the regulation, which is reflected in the importance of audits and investigations. Supervisory authorities are independent public authorities established by each EU member state to oversee the application of GDPR and protect individuals' rights in relation to their personal data.

They have the power to conduct audits of organizations, investigate complaints made by data subjects, monitor compliance with GDPR, and provide guidance on data protection practices. This includes the ability to impose corrective measures, issue warnings, and in severe cases, impose fines for violations of data protection laws. These responsibilities are vital for maintaining the integrity of data protection obligations and ensuring that individuals' rights are upheld.

In contrast, the other options do not accurately capture the supervisory authorities' main functions. For example, while some supervisory authorities may provide training or guidance on data protection best practices, this is not their primary responsibility. Their role does not include acting as legal representatives for data subjects, as that responsibility falls to individuals or their legal representatives. Moreover, supervisory authorities do have the authority to impose fines and sanctions, which is a crucial aspect of enforcing GDPR compliance.