What should you do from the Azure Active Directory admin center?

You have a Microsoft Azure Active Directory (Azure AD) tenant named contoso.onmicrosoft.com.

An external user has a Microsoft account that uses an email address of [email protected].

An administrator named Admin1 attempts to create a user account for the external user and receives the error message shown in the following exhibit.

You need to ensure that Admin1 can add the user.

What should you do from the Azure Active Directory admin center?
A . Add a custom domain name named outlook.com.
B. Modify the Authentication methods.
C. Modify the External collaboration settings.
D. Assign Admin1 the Security administrator role.

Answer: C

Explanation:

Reference: https://docs.microsoft.com/en-us/azure/active-directory/b2b/delegate-invitations