What is the purpose of creating an account in Active Directory with Replication User privilege for the use of the SteelH

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What is the purpose of creating an account in Active Directory with Replication User privilege for the use of the SteelHeads?

A. It allows SteelHeads to authenticate users on behalf of the Domain Controllers
B. It allows SteelHeads the ability to automatically run backups to a SMB file share within a Windows Domain
C. It enables the SteelHead admins to authenticate with Active Directory when managing the SteelHeads
D. It allows the optimization of encrypted MAPI and SMB3/3 traffic using end-to-end Kerberos authentication