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What is a callback?
All of these
Biometric authentication system.
Modem-based authentication system
Biometric thumb print machines
A callback is an authentication technique that calls the sender back. After connection is made, the receiving side breaks the connection and calls the sender to ensure that the logon was made from the authorized computer. Callback prevents a stolen ID and password from being used on a different machine.
Reference: http://www.pcmag.com/encyclopedia/term/39229/callback
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