What should you do?

You have a DNS zone named contoso.com that contains the following records.

You purchase a Microsoft 365 subscription.

You plan to migrate mailboxes to Microsoft Exchange Online.

You need to configure Sender Policy Framework (SPF) to support Exchange Online.

What should you do?
A . Add an additional TXT record.
B . Modify the TXT record.
C . Modify the expire interval of the SOA record.
D . Modify the default TTL of the SOA record.

Answer: B

Explanation:

Explanation: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-spf-in-office-365-to-help-prevent-spoofing?view=o365-worldwide#next-steps-after-you-set-up-spf-for-office-365