Which of these is an ITU-T standard protocol suite for packet-switched wide area network (WAN) comm

Q. Which of these is an ITU-T standard protocol suite for packet-switched wide area network (WAN) communication?
Answer: X.25
Notes: X.25 is an ITU-T standard protocol suite for packet-switched wide area network (WAN) communication. Unlike ARPANET, it was available for business use.

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