Which one of the following factors is NOT one on which Authentication is based?

Which one of the following factors is NOT one on which Authentication is based?
A .  Type 1 Something you know, such as a PIN or password
B .  Type 2 Something you have, such as an ATM card or smart card
C .  Type 3 Something you are (based upon one or more intrinsic physical or behavioral traits), such as a fingerprint or retina scan
D .  Type 4 Something you are, such as a system administrator or security administrator

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Answer: D

Explanation: Authentication is based on the following three factor types: Type 1. Something you know, such as a PIN or password Type 2. Something you have, such as an ATM card or smart card Type 3. Something you are (Unique physical characteristic), such as a fingerprint or retina scan

Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 36. Also: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter 4: Access Control (pages 132-133).