You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest named Company.com containing three sites named KingSite1， KingSite2 and KingSite3.The Company.com organization makes use of Microsoft Exchange Server 2007 Service Pack 1 （SP1） as their messaging solution.Company.com has additionally configured each site with two Client Access server， Mailbox server and Hub Transport Server.During the course of the business week you receive instruction from Company.com to install Microsoft Exchange Server 2010 in KingSite1 whilst ensuring that you use the least amount of administrative effort.What should you do？（）

• A、You should consider having all Exchange servers in the organization upgraded to Microsoft Exchange Server 2007 Service Pack 2 （SP2）.
• B、You should consider having all Exchange servers in KingSite1 and all Client Access servers in the organization upgraded to Microsoft Exchange Server 2007 Service Pack 2 （SP2）.
• C、You should consider having all Client Access servers in the organization upgraded to Microsoft Exchange Server 2007 ServicePack 2 （SP2）
• D、You should consider having all Exchange servers in KingSite1 upgraded to Microsoft Exchange Server 2007 ServicePack 2 （SP2）.