You are responsible for securing your organizations Exchange online environment. To help prevent impersonation attacks, you wish to enable artificial intelligence (AI) as a policy for all users. What should you configure?

Answer options:

A.Litigation Hold
B.Security defaults
C.Mailbox intelligence
D.Safe attachment policy

Correct Answer: C
Option A is incorrect. This is a notification sent from an organization`s legal team to employees instructing them not to delete electronically stored information that may be relevant to a legal case.
Option B is incorrect. This is a free security baseline offered by Microsoft.
Option D is incorrect. This is a policy to protect against malicious attachments.
Reference: 
To know more about Mailbox Intelligence and other anti-phishing methods, please refer to the link below: 

https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-anti-phishing-policies?view=o365-worldwide