In a Cisco Unified Communications environment, Cisco Unified Communications Manager can use DNS name or IP addresses for

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In a Cisco Unified Communications environment, Cisco Unified Communications Manager can use DNS name or IP addresses for system addressing. What are three advantages of using IP addresses instead of DNS names? (Choose three.)

A. Does not require a DNS server
B. Prevents the IP telephony network from failing when the DNS is unavailable
C. IP addressing allows the use of service records to provide redundancy
D. Decreases the amount of time that is required when a device attempts to contact the Cisco Unified Communications Manager server
E. Provides for better denial-of-service prevention