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The basic language of modems and dial-up remote access systems is:
Correct Answer: A
Explanation/Reference: Explanation: Asynchronous start-stop is the physical layer used to connect computers to modems for many dial-up Internet access applications, using a data link framing protocol. Incorrect Answers: B: Dial-up modems use Asynchronous, not synchronous, communication. C: Dial-up modems connect to a remote system using communication, not interaction. D: Dial-up modems connect to a remote system using communication, not interaction. References: https://en.wikipedia.org/wiki/Asynchronous_serial_communication