What is a large public computer network through which computers can exchange information at high speed?

Server

Explanation:

The Question is vauge, but I believe a Server is the word you're looking for. Computer Network could mean various things, in this case im going to assume that by Network, its saying Server. As a server is what allows for high speed interactions between a host computer and a client computer.

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.

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