Your network contains 

Your network contains an Active Directory domain named contoso.com. The contoso.com DNS zoneis stored in Active Directory. All domain controllers run Windows Server 2008 R2.   You need to identify if all of the DNS records used for Active Directory replication are correctly registered.   What should you do（）

• AFrom the command prompt， use netsh.exe.
• BFrom the command prompt， use dnslint.exe.
• CFrom the Active Directory Module for Windows PowerShell， run the Get-ADRootDSE cmdlet.
• DFrom the Active Directory Module for Windows PowerShell， run the Get-ADDomainController cmdlet.