The company has a Windows 2008 Active Directory-based network.The network contains an Exchange Server 2003 organization.The management instructs you to deploy Exchange Server 2010 in your network.You decide to prepare the schema and domain first.Which of the following commands should you run prior to performing the normal schema and domain preparation？（）

• A、Setup /PrepareSchema
• B、Setup /PrepareLegacyExchangePermissions
• C、Setup /PrepareAD
• D、Setup /PrepareLegacyExchangePermissions：child.Xxx