Which of the following must be proven to ensure message or transaction nonrepudiation?
A. The integrity of the message or transaction cannot have been compromised after it was last controlled by the party sending the message or performing the transaction.
B. The level of nonrepudiation is tightly linked to the strength of authentication of the party sending the message or performing the transaction.
C. Both A and B are true.
D. Neither A nor B is true.
Answer: C. Both A and B are true.
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