Which of the following satisfies a two-factor user authentication?

A. Iris scanning plus fingerprint scanning

B. Terminal ID plus global positioning system (GPS)

C. A smart card requiring the users PIN

D. User ID along with password

Explanation:

A smart card addresses what the user has. This is generally used in conjunction with testing what the user knows, e.g., a keyboard password or personal identification number (PIN). Proving who the user is usually requires a biometrics method, such as fingerprint, iris scan or voice verification, to prove biology. This is not a two-factor user authentication, because it proves only who the user is. A global positioning system (GPS) receiver reports on where the user is. The use of an ID and password (what the user knows) is a single- factor user authentication.