You have a hybrid deployment between a Microsoft Exchange Online tenant and on-premises Exchange Server 2019 organization. The on-premises organization contains several Exchange Server 2019 servers.
You discover that delivery fails for all email messages sent from the on-premises organization to Microsoft 365.
You discover that the certificate for an on-premises Exchange server expired.
You need to resolve the issue as quickly possible. The solution must minimize administrative effort.
What should you do on the on-premises Exchange server?
A. Create a new self-signed certificate.
B. Generate a certificate renewal request.
C. Generate a certificate request.
D. Add the certificate for a new root certification authority (CA).
