You have a Microsoft 365 subscription.
All users have their email stored in Microsoft Exchange Online.
In the mailbox of a user named User1, you need to preserve a copy of all the email messages that contain the word ProjectX.
What should you do?
A. From the Security & Compliance admin center, create an eDiscovery case.
B. From the Exchange admin center, create a mail flow rule.
C. From the Security & Compliance admin center, start a message trace.
D. From Microsoft Cloud App Security, create an access policy.
