What should you use?

You have a hybrid deployment between a Microsoft Exchange Online tenant and an on-premises Exchange Server 2019 organization.

Users report that emails sent from Exchange Online mailboxes to the on-premises Exchange Server mailboxes are undelivered.

You need to review the non-delivery report (NDR) for each undelivered email.

What should you use?
A . message trace in the Exchange admin center
B. auditing in the Exchange admin center
C. the SMTP protocol logs in Exchange Server
D. the transport logs in Exchange Server

Answer: A

Explanation:

Reference: https://docs.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-faq