Which One of the Following Best Reflects Technology-Based Discussions as the Textbook

Which one of the following best reflects technology-based discussions as the textbook describes them?

A) Students share their work on a classroom data base, give one another feedback, and build on one another's ideas.
B) At a pre-designated time, students sit at computer terminals in pairs or trios and converse with their peers across the nation.
C) Students "meet" in Internet "chat rooms" during the evening hours to work on cooperative group projects.
D) Two classes in distant locations use telephone lines and video technology to exchange ideas about a topic of mutual interest.