What do you want to “know” to prove yourself that it was Bob who had send a mail?

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Bob, your senior colleague, has sent you a mail regarding aa deal with one of the clients. You are requested to accept the offer and you oblige.

After 2 days, Bob denies that he had ever sent a mail.

What do you want to “know” to prove yourself that it was Bob who had send a mail?
A . Confidentiality
B . Integrity
C . Non-Repudiation
D . Authentication

Answer: C