Which of the following is NOT listed as a method of positive identification?

• A. Username and password
• B. Magnetic card reader
• C. Bar code reader
• D. Biometric method

Answer: (A)

Positive identification means proving exactly who a person is using something tied to them or inherent to them. Magnetic card readers, bar code readers, and biometric methods all rely on a unique token or intrinsic trait linked to the individual—a card, a badge’s barcode, or a biological characteristic—providing direct proof of identity at the point of access. Username and password, on the other hand, are credentials used to authenticate someone who claims an identity. They identify a user name and then verify it with a password, but they do not by themselves provide an intrinsic or physical proof of who the person is. Passwords can be shared, stolen, or guessed, making them less robust as positive identification. That’s why the only option that isn’t a true positive identification method is the combination of a username and password.