Regulatory requirements mandate an auditable access record for certain data. Assuming logs are archived, where should that data be stored to meet the mandate?

The correct option is BigQuery with Data Access logs because BigQuery provides robust access control mechanisms, and Data Access logs specifically record every data read and write operation, including who accessed the data and when. This granular logging is essential for meeting strict auditable access record requirements. Storing data in Cloud Storage with customer-supplied encryption keys doesn't inherently provide the necessary auditable access records for individual user access to the data itself, only for access to the encrypted objects. Cloud SQL Admin activity logs track administrative actions on the database, not necessarily every data access by individual users. While an App Engine service could log access, it introduces an additional layer of complexity and potential points of failure compared to the native logging capabilities of BigQuery.