Explain the difference between "sleep mode" and "shutdown "

When you shut down your electronic, all your open programs close and the electronic shuts down your operating system. An electronic that's shut down uses almost no power. In sleep mode, the electronic enters a low-power state. The electronics state is kept in memory.

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.

you paid for the subscription lol