An iris scan is an example of the "what you know" aspect of personal identification.

Question

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The best form of security for personal identification encompasses three aspects i.e. ,what you know,what you have,and who you are.The first,"what you know" is something like a password,something that everyone can create and has.The second,"what you have" is something like a card such as an ATM card.Most personal identification security systems do not include the third kind,i.e. ,"who you are," such as an iris scan which is some form of a biometric.

An Iris Scan Is an Example of the "What You