Managing Email Channels for Microsoft Teams

C.

The correct answer is B. the list of accepted domains in Microsoft Exchange Online.

Explanation: To restrict team channels to receive emails from only specific email domains, you need to modify the list of accepted domains in Microsoft Exchange Online. The list of accepted domains determines which email domains can send email to recipients in your organization. When you add a domain to the accepted domains list, Exchange Online accepts email messages that use the domain in the From address.

To modify the accepted domains list, follow these steps:

1. Sign in to the Microsoft 365 admin center with your admin account.
2. In the left navigation pane, click on "Exchange" to go to the Exchange admin center.
3. In the Exchange admin center, click on "Accepted domains" under the "Mail flow" section.
4. Select the accepted domain you want to modify and click the "Edit" button.
5. In the "Edit accepted domain" pane, select the "Authoritative" radio button to restrict email delivery to only the specified domains. Add the domain "@fabrikam.com" to the list of domains.
6. Click "Save" to save the changes.

Note that modifying the External collaboration settings in the Azure Active Directory admin center (answer A) would not achieve the desired result as this setting controls external sharing for files, folders, and sites in SharePoint and OneDrive, and does not affect email delivery to team channels. Similarly, modifying the org-wide Teams settings (answer C) and the global teams policy (answer D) would not address this requirement as they do not control email delivery to team channels.