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need 100% correct answer in computer network User A sends a message to user B through the computer network, expressing that he is willing to

need 100% correct answer in computer network
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User A sends a message to user B through the computer network, expressing that he is willing to sign a certain contract, and then user A regrets it and does not admit that he has sent the message. To prevent this from happening. authentication techniques should be employed.) A right B wrong

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