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As the manager of Project A in your organization's Google Cloud setup, you encounter an issue: API access, including Pub/Sub, is blocked by a VPC Service Control (SC) perimeter. However, a resource under a service account in Project B needs access to retrieve messages from a Pub/Sub topic in Project A, which lies outside the perimeter. How can you grant access from Project B to the Pub/Sub topic in Project A while adhering to the principle of least privilege?