What should you recommend?

You have an Exchange Server 2013 organization that contains two Client Access servers and two Mailbox servers.
You configure DNS round robin on the Client Access servers. All of the host (A) and alias (CNAME) records in the DNS zone are configured to have a TTL value of 10 minutes.
You need to recommend a solution to fail over client connections to a Client Access server automatically if Internet Information Services (US) fails. The solution must minimize costs.
What should you recommend?
A. Deploy a Client Access server array.
B. Reduce the TTL values on all of the A and CNAME records to one minute.
C. Deploy a hardware load balancing solution.
D. Deploy Network Load Balancing (NLB) on each Client Access server.

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