Question: Alice initiates a challenge - response user authentication protocol to authenticate her to Bob. Bob sends Alice a challenge. Which is not true about the

Alice initiates a challenge-response user authentication protocol to authenticate her to Bob. Bob sends Alice a challenge. Which is not true about the challenge?
The challenge must be un-predictable to Alice.
The challenge must be un-predictable to Bob.
Alice's response needs to be based on the challenge.
The challenge must not be re-used.
Alice initiates a challenge-response user authentication protocol to authenticate her to

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