All employees at a company have Exchange Online mailboxes. You observe a surge in email messages that contain malware. Y

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All employees at a company have Exchange Online mailboxes.
You observe a surge in email messages that contain malware. You determine that all of the messages originate from a single IP address.
You need to ensure that no email messages from the IP address are delivered to the users.
What should you do?

A. Create a malware filter.
B. Create a connection filter.
C. Create a content filter.
D. Create a new transport rule.