What is a domain name system (DNS)?
A. allows dynamic IP address allocation so users do not have to have a preconfigured IP
address to use the network
B.converts IP addresses into domains, or identifying labels that use a variety of
recognizable naming conventions
C. the efficient coexistence of telephone, video, and data communication within a single
network, offering convenience and flexibility not possible with separate infrastructures
D. the integration of communication channels into a single service
What has the potential to contain more than one value for an attribute?
A. single-valued attribute
C. null-valued attribute
D. All of these are correct.