Ethernet was developed in the early 1970s by Robert Metcalfe and his team at Xerox Corporation’s Palo Alto Research Center (PARC). It became the foundational technology for local area networks (LANs) and remains widely used in networking today.
IBM (B) developed other networking technologies but not Ethernet.
Microsoft (C) is a software company and did not develop Ethernet.
[References:, , PSP Study Guide – Network Communication Protocols, , Historical Overview of Ethernet – IEEE Standard]
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