You have an Exchange Server 2010 organization. 
You plan to delegate administration of the organization. 
You have a group named Technicians that contains all the level-two technicians in the organization. You need to ensure that the Technicians group can manage the properties of all the mailbox databases. The solution must minimize the number of permissions assigned to the Technicians group. 
Which management role should you assign to the Technicians group？（）

You have an Exchange Server 2010 organization. 
You plan to provide users with the ability to schedule meetings. 
You need to recommend a scheduling solution that meets the following requirements：
.Ensures that users can schedule conference rooms for meetings
.Ensures that conference room owners can change the settings of meetings scheduled by users 
What should you include in the solution？（）