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 Microsoft Cloud App Security, create an activity policy.
B. From the Security & Compliance admin center, create a data loss prevention (DLP) policy.
C. From the Exchange admin center, start a mail flow message trace.
D. From the Security & Compliance admin center, create an eDiscovery case.
