You work as a network exchange administrator at examways.com.the examways.com network currently consists of a single active directory forest containing a single domain named company.com.both the forest and the domain operate at the windows server 2003 functional level.the company.com organization currently makes use of microsoft exchange server 2003 service pack 2 （sp2） as their messaging solution.during the course of the business week you receive instruction from company.com to migrate the messaging system to exchange server 2010 whilst preparing the active directory environment for the deployment of microsoft exchange server 2010. what should you do first？（）

A. you should prepare the active directory forest by having the setup.com /adprep.exe /forest prep command run.
B. you should prepare the active directory forest by having the setup.com /pre pare schema command run.
C. you should prepare the active directory domain by having the setup.com /pre paread command run.
D. you should prepare the active directory domain by having the setup.com /pre pare domain command run.