Which procedure is NOT a valid mechanism for performing account proofing when users are attempting to log into their account?
A. Have the user type in the username and password a second time.
B. Send a text message to the user's phone.
C. Ask the user three security questions based upon facts that only the user is likely to know.
D. Have the user click a hyperlink in an email message.
Answer: A. Have the user type in the username and password a second time.
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