The medium for integrating media is______.

A．the appearance of the smaller, low-cost and powerful computers.
B．the interrelated telephone wires, optic fibers, undersea cables, microwave links.
C．the popularity of TV channels and satellite communication.
D．the fast development of computer and communication technology.

A．whether more people have access to PCs.
B．the provision of more interfaces to the Internet.
C．the improvement of the technology of virtual reality.
D．whether the users will accept the new technology or not.