Q$\mathrm{.}2$: When you want to authenticate yourself to your computer, most likely you type in your

username and password. The username is considered public knowledge, so it is the

password that authenticates you. Your password is something you know.

$($a$)$ It is also possible to authenticate based on something you are, that is$,$ a physical

characteristic. Such a characteristic is known as a biometric. Give an example of

biometric$-$based authentication.

$($b$)$ It is also possible to authenticate based on something you have, that is$,$ something in

your possession. Give an example of authentication based on something you have.

$($c$)$ Two$-$factor authentication requires that two of the three authentication methods

$($something you know, something you have, something you are$)$ be used. Give an

example from everyday life where two$-$factor authentication is used. Which two of the

three are used?