You work for the Xxx Corporation.You are planning to install Exchange 2010 in all domains of the Xxx forest.The forest structure is shown in the diagram below： What command should you run to prepare the domains in the Xxx forest for Exchange 2010？（）
- Asetup /PrepareAD /on：Xxx
- Bsetup /PrepareDomain：Xxx
- Csetup /pad
- Dsetup /