Microsoft 365 Certified: Copilot and Agent Administration Fundamentals (AB-900) - Microsoft

You can use a Microsoft Entra security group to assign permissions to Microsoft Entra ID resources. Answe r: Yes You can use a Microsoft Entra security group to assign Microsoft 365 licenses. Answe r: Yes You can use a Microsoft Entra security group to assign permissions to Microsoft Exchange mailboxes. Answe r: No

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The correct selections are Yes, Yes, Yes. For statement 1, Microsoft Support explains that if you are not a site owner, you might still be able to invite other people to the site, although the invitation can generate an access request that a site owner approves or declines. Microsoft also states that site users have the opportunity to invite other people to collaborate on sites, unless that feature is disabled. That makes the statement true.<br />
For statement 2, Microsoft Learn states that in SharePoint you can give people permissions to a site<br />
by adding individual users, security groups, or Microsoft 365 groups to one of the three SharePoint groups, including the Members group. That directly supports the statement.<br />
For statement 3, Microsoft documents that site ownership and membership can be managed by<br />
adding or removing owners, members, site owners, site members, and site visitors. For group- connected sites, Microsoft also documents that owners can manage group ownership and remove owner status. Therefore, a site owner can remove another site owner, provided at least one owner remains.

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The correct answer is adding a public DNS record. Microsoft documents that when you add a custom domain to Microsoft 365, you must first prove ownership of that domain before Microsoft 365 can use it for services such as Exchange Online, SharePoint, and user sign-ins. The standard verification method described by Microsoft is to add a DNS record at your domain registrar or DNS hosting provider. Microsoft commonly uses a TXT record for verification, although in some cases an MX record can also be used depending on the setup flow. This is why “adding a public DNS record” is the right completion for the sentence. The other choices are not the standard Microsoft 365 domain verification process. Microsoft’s admin guidance does not use confirming your business address, uploading a certificate, or uploading a webpage as the normal method for proving ownership of a domain in Microsoft 365. Domain verification is specifically tied to DNS because DNS is the authoritative public system used to prove control over the domain name.

The correct answers are A and D because both tasks are supported directly in the Exchange admin center (EAC). Microsoft Learn states that administrators can manage mail flow rules in Exchange Online from the EAC under Mail flow > Rules, which includes creating and managing transport rules<br />
for organizational email handling. Microsoft Learn also states that administrators can create shared<br />
mailboxes in the EAC under Recipients > Mailboxes, where a shared mailbox can be added and then delegated to users.<br />
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Option B is incorrect because adding a custom domain is normally done in the Microsoft 365 admin center, specifically on the Domains page. Although Exchange can later work with accepted domains and related mail flow settings, the act of adding and verifying a custom domain is not an Exchange admin center task. Option C is incorrect because license assignment is handled through Microsoft 365 or Microsoft Entra administrative tools, not the Exchange admin center.

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