To enforce data modification requirements after migrating an application, what should be created?

Creating an access policy for the blob service is vital in enforcing data modification requirements after migrating an application because it allows you to define specific permissions that govern how data can be accessed, modified, and managed within Azure Blob Storage. Access policies provide fine-grained control, enabling you to specify who can perform operations like read, write, or delete on the data.

This approach is particularly effective when you want to ensure that certain users or services have restricted access, which is essential for maintaining the integrity and security of your data post-migration. By utilizing access policies, any changes to data will be tightly controlled and monitored, aligning with compliance and regulatory requirements.

In contrast, Azure resource locks are primarily used to prevent accidental deletion or modification of resources temporarily but do not address the granularity of permissions regarding data modification. Azure RBAC (Role-Based Access Control) assignments are more generalized and control access to resources at a broader level, which may not suffice for strict data modification requirements. Access level modifications for the blob service provide enhanced capabilities to adjust permissions but do not establish structured policies that can be easily managed and enforced over time. Therefore, implementing an access policy directly supports the enforcement of defined data modification requirements effectively.