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Two-factor authentication requires how many pieces of identification?

AFour
BTwo
CTen
DSix
Answer & Solution
Correct answer: B. Two
1. A username and password form the first piece. 2. A code to a phone or an email may form the second. 3. So two pieces are needed. _Source: OpenStax, Workplace Software and Skills, Ch 1 'Technology in Everyday Life and Business'_
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