Which of the following is true of two-factor authentication?

Which of the following is true of two-factor authentication?
A .  It uses the RSA public-key signature based on integers with large prime factors.
B .  It requires two measurements of hand geometry.
C .  It does not use single sign-on technology.
D .  It relies on two independent proofs of identity.

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Answer: D

Explanation: It relies on two independent proofs of identity. Two-factor authentication refers to using two independent proofs of identity, such as something the user has (e.g. a token card) and something the user knows (a password). Two-factor authentication may be used with single sign-on.

The following answers are incorrect: It requires two measurements of hand geometry. Measuring hand geometry twice does not yield two independent proofs.

It uses the RSA public-key signature based on integers with large prime factors. RSA encryption uses integers with exactly two prime factors, but the term "two-factor authentication" is not used in that context.

It does not use single sign-on technology. This is a detractor.

The following reference(s) were/was used to create this question: Shon Harris AIO v.3 p.129

ISC2 OIG, 2007 p. 126