You need to set up the global administrator account

Contoso Ltd. has an on-premises SharePoint environment.The company plans to deploy SharePoint Online.
You must use Active Directory Federation Services (AD FS). The global administrator account must be able to access the Office 365 tenant even if AD FS is
unavailable.
You need to set up the global administrator account.
What should you do?

A.
In the Office 365 admin center, create a user named [email protected].

B.
In the Office 365 admin center, create a user named [email protected].

C.
In Active Directory Domain Services Users and Computers, create a user named [email protected].

D.
In Active Directory Domain Services Users and Computers, create a user named [email protected].