Which two tasks should you recommend performing?

Your company has three Datacenters.
The data centers are located in Montreal, New York,and Seattle.
You have an Exchange Server 2013 Organization that contains six Servers.
The Servers are configured as shown in the following table.

The organization is configured as shown in the following exhibit. (Click the Exhibit button.)

The File Share Witness for DAG1 is located on EX3.
You plan to implement Site Resiliency and use a Single Name Space named mail.contoso.com.
You need to recommend a solution to minimize the amount of time that the Exchange Server Services are
unavailable if either the data center in Montreal or the Datacenter in Seattle fails.
Which two tasks should you recommend performing?
(Each correct answer presents part of solution. Choose two.)
A. Deploy a Hardware Load Balancer to EX3 and EX6.
B. Create two DNSHost (A) Records for mail.contoso.com.
C. Configure EX6 as an alternate File Share Witness.
D. Move the File Share Witness to Server1.

Answer: AD