Answer:
The right answer is "something you have".
Explanation:
There are various types of authentication systems for web use.
Two-factor authentication is one of the main authentication system which uses the combination of "something you know" and "something you have" elements.
Here "something you know" refers to the credential a user uses to login i.e password, pin, etc.
While "something you have" refers to the hardware device or any taken which can be used to verify user's identity i.e OTP send on a phone or Email, smartcard, etc.
Two-factor authentication is a security system that uses the combination of "something you know" with "something you have."
2FA is an acronym for two-factor authentication and it can be defined as a secutrity system that is designed and developed to require end users to provide two (2) separate but unique forms of identification, so as to enable them access and use a secured resource.
In cyber-security, two-factor authentication is a secutrity system that uses the combination of something an end user knows with something he or she has such as one-time password.
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