A corporate environment includes Exchange Server 2010 SP1. The Exchange Server environment includes one Hub Transport server, one Client Access server, and one Mailbox server. You are designing an infrastructure for a secondary datacenter that will provide site resiliency for the primary datacenter that contains the existing Exchange Server environment. You have the following requirements:

* Ensure that employees can access email if the primary datacenter fails.
* Ensure that each Mailbox database is active in only one datacenter at a time.
* Minimize the number of Exchange servers required.

You need to recommend a solution that meets the requirements.

Which two actions should you recommend? (Each correct answer presents part of the solution.Choose two.)

A.
In the secondary datacenter, deploy one server with the Hub Transport, Client Access, and Mailbox roles. Create a database availability group (DAG) that spans both datacenters.

B.
In the secondary datacenter, deploy one server with the Hub Transport and Client Access roles, and one server with the Mailbox role. Create a database availability group (DAG) that spans both datacenters.

C.
Enable datacenter activation coordination (DAC) mode.

D.
Disable datacenter activation coordination (DAC) mode.