What are the three strategies that can be used to authenticate a user to a computer system? Describe how authentication can be done using hardware tokens.

Authentication is the process of verifying the identity of a user attempting to access a computer system or network. The goal of authentication is to ensure that only authorized users are granted access, which is essential for maintaining the security and integrity of the system. There are various authentication strategies that can be used to accomplish this goal, but three common strategies are:

1. Knowledge-based authentication (KBA): This is a type of authentication that requires users to provide some secret information such as a password, PIN, or security question to prove their identity. _____ ____ _________ ______ _____ ______ _____ ______ _______ ________.
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