'Something you are' refers to a unique physical characteristic of an individual that can be used for biometric authentication. Fingerprint scanning is an example of a biometric authentication method that uses a physical trait, making it the correct answer. Traditional PIN codes are knowledge-based, security tokens are possession-based, and location data is a context-based factor, therefore, these options do not fit the 'something you are' category.
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What is biometric authentication?
What are the different types of authentication factors?
How does fingerprint scanning work as a biometric method?