Comprehensive and Detailed in Depth Explanation:

To prevent application downtime due to expired dynamic credentials while maintaining security, the application should renew the lease before it expires. The HashiCorp Vault documentation states: "The application should frequently ‘check-in’ with Vault and renew the lease to prevent the lease from expiring." It adds: "A lease must be renewed before it has expired. Once it has expired, it is permanently revoked and a new secret must be requested."

The docs elaborate: "Dynamic secrets are designed to be short-lived and automatically rotated or revoked when their lease expires. Renewing the lease extends its validity, ensuring continuous access without compromising the security benefits of short-lived credentials."A (Static credentials)reduces security by eliminating rotation.C (Revoke)ends access early.D (Different auth method)doesn’t address lease management. Thus, B is correct.