Which authentication method is recommended for a production application connecting to Azure Service Bus?

1. A Shared Access Signature (SAS) connection string
2. ✓ B Azure Managed Identity with appropriate RBAC role (correct answer)
3. C Username and password
4. D IP whitelist only

Shortcut: Managed identity eliminates credential management. Assign the Azure Service Bus Data Sender or Data Receiver role to the managed identity for least-privilege access.