What are two roles of Domain Name Services (DNS)? (Choose Two)

What are two roles of Domain Name Services (DNS)? (Choose Two)
A . builds a flat structure of DNS names for more efficient IP operations
B. encrypts network Traffic as it travels across a WAN by default
C. improves security by protecting IP addresses under Fully Qualified Domain Names (FQDNs)
D. enables applications to identify resources by name instead of IP address
E. allows a single host name to be shared across more than one IP address

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Answer: D,E