you want to deploy a solution that will provide the shortest range and the most non ovcerlapping cahnnels to prevent interface which wireless standard should you deploy

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.

they really not common the os x is just a better version of the os like in iphone theirs xr and their xs

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