Question: An employee tries to mask his identity by programmatically changing the From field to a - nony - mouse in an email. He uses

An employee tries to mask his identity by programmatically changing the From field to "a-nony-mouse" in an email. He uses periodic intervals to send the email to the entire company promoting a product he is selling online. An investigation reveals who sent the message. What capability of cryptography was used to confirm the sender's identity?
a. Metadata
b. Obfuscation
c. Repudiation
d. Nonrepudiation

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