VMs in the web-applications project need BigQuery dataset access in crm-databases-proj. Following best practices for cross-project service account access, what should you do?

The correct approach is to grant the bigquery.dataViewer role on the crm-databases-proj to the service account(s) or other identities associated with the VMs in the web-applications project. This follows the principle of least privilege, providing only the necessary BigQuery access in the target project. You would also ensure the VMs have the necessary roles within their own web-applications project to use their service accounts. Incorrect options are: Granting Project Owner roles is overly permissive and violates the principle of least privilege, giving broad control instead of specific BigQuery access. Granting bigquery.dataViewer on web-applications is irrelevant for accessing BigQuery data in crm-databases-proj.