You have an Exchange Server 2010 organization. The network contains an Exchange Server 2010 Mailbox server named Server1. All mailboxes are stored on Server1. You perform a Typical installation of Exchange Server 2010 on a new server named Server2. You plan to implement redundancy for mailbox access. You need to recommend a solution that ensures that client computers can reconnect to their mailbox within five minutes if Server1 fails.
What should you recommend?
A.
Configure cluster continuous replication (CCR). Implement a file share witness.
B.
Configure a Network Load Balancing cluster that includes Server1 and Server2. Implement Active Directory-integrated DNS zones.
C.
Configure a database availability group (DAG) that includes Server1 and Server2. Set the time to live (TTL) for the DNS record.
D.
Configure a database availability group (DAG) that includes Server1 and Server2. Use the same certificate for both servers.