The “AT” in the Hayes AT standard command set was so named:

a. because a Hayes modem came standard with the “AT” PC computer specification.
b. for the AppleTalk communications protocol that it uses.
c. because the “@” (at) symbol is the standard conjunction between the user id and the domain (such as in most email addresses).
d. because it established the Asynchronous Transfer mode.
e. for the ATTENTION command that precedes all other commands.


e. for the ATTENTION command that precedes all other commands.

Computer Science & Information Technology

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