Which two DNS records should you test?

You have a Microsoft Exchange Online tenant.

Remote users report that they receive an error message when they attempt to add their email account to Microsoft Outlook.

You need to confirm that the DNS records resolve correctly for the users.

Which two DNS records should you test? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.
A . autodiscover.outlook.com
B. smtp.office365.com
C. outlook.office365.com
D. security.microsoft365.com
E. portal.office.com

Answer: A,C

Explanation:

Reference: https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/incorrect-settings