The Three Classic Ways of Authenticating Yourself to Computer Security Software

C.

This is more commonly known as biometrics and is one of the most accurate ways to authenticate an individual.

The rest of the answers are incorrect because they not one of the three recognized forms for Authentication.

The three classic ways of authenticating yourself to computer security software are known as "authentication factors." These factors are something you know, something you have, and something you are.

1. Something you know: This authentication factor involves using information that only the authorized user should know, such as a password, PIN, or security question answer. This factor relies on the assumption that only the legitimate user knows the secret information, and therefore can prove their identity to the system.

2. Something you have: This authentication factor involves the use of physical devices that the user possesses and which the system recognizes as belonging to the user. Examples of such devices include smart cards, security tokens, and USB drives. This factor relies on the assumption that only the legitimate user has access to the physical device and can use it to authenticate their identity.

3. Something you are: This authentication factor is based on biological or behavioral characteristics unique to the user, such as fingerprints, retina scans, or voice recognition. This factor relies on the assumption that only the legitimate user possesses the unique biological or behavioral characteristics that can be recognized by the system, and therefore can authenticate their identity.

Option A, "you need," does not accurately describe an authentication factor. Option B, "non-trivial," does not provide a clear explanation of an authentication factor. Option C, "you are," accurately describes the something you are authentication factor. Option D, "you can get," does not accurately describe an authentication factor.

Therefore, the correct answer is C, "you are."