To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Carrier Handshake Availability Protocol - This option is incorrect because "CHAP" does not stand for "Carrier Handshake Availability Protocol".
Option B) ChallengeHandover Authentication Protocol - This option is incorrect because "CHAP" does not stand for "ChallengeHandover Authentication Protocol".
Option C) canonical Handshake Availability Protocol - This option is incorrect because "CHAP" does not stand for "canonical Handshake Availability Protocol".
Option D) Challnge Handshake Authentication Protocol - This option is correct. "CHAP" stands for "Challenge Handshake Authentication Protocol". CHAP is a protocol used for authenticating a user or device on a network.
The correct answer is D) Challnge Handshake Authentication Protocol.