Implementing custom application logic to enforce access controls, as it provides the flexibility to meet any specific security requirement without relying on external systems.

Using Azure Active Directory (Azure AD) integration with Delta Lake to manage access controls, as it leverages Azure's built-in security features and supports scalable, role-based access control (RBAC) that complies with GDPR.

Deploying a third-party access control system alongside Delta Lake, as it offers the most comprehensive security features and compliance certifications out of the box.

Relying on the underlying storage account's access control lists (ACLs) for securing Delta Lake tables, as it simplifies the security model by using existing Azure storage security features.