Which are three examples of "what you know" access control? (Choose three.)

Question

Options

• APassword
• BCoded lock
• CIris detection sensor
• DSpeaking into a voice recognition sensor
• EUse of keyboard commands to log in to a computer system

• A
  78% (40)
• B
  2% (1)
• C
  6% (3)
• D
  2% (1)
• E
  12% (6)

Explanation

"What you know" authentication relies on information stored in memory, such as passwords, PINs, or combinations. Options A (Password), B (Coded lock), and E (Use of keyboard commands to log in) all qualify because each requires recalling a specific piece of secret information - a password, a numeric or alphanumeric combination, or a specific command sequence. Options C and D are distractors because iris detection and voice recognition are biometric identifiers that fall under "what you are" authentication, not "what you know" - they measure a physical characteristic of the person rather than something memorized. Option D is especially tricky because speaking feels active, but voice recognition authenticates the unique biological properties of your voice, making it biometric.

Memory tip: The three authentication factor categories are "know, have, are." If you can write it down and memorize it, it belongs to "what you know." If it involves a body part or biological trait, it belongs to "what you are."

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