Help me i dont get it

Selling a product through an electronic medium is

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service

How often does colleges update the cost of attendance on their website? . a)every two years b) every four years c) every year d) every semester