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Option A.
UNIX treat everything as a file.

This key design principle consists of providing a unified paradigm for accessing a wide range of input/output resources: documents, directories, hard-drives, CD-Roms, modems, keyboards, printers, monitors, terminals and even some inter-process and network communications.
Ref : - https://web.archive.org/web/20120320050159/http://ph7spot.com/musings/in-unix-everything-is-a-file
https://en.wikipedia.org/wiki/Everything_is_a_file

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