The correct answer requires a physical object that the user must possess in order to authenticate, known as 'something you have'. Unlike knowledge-based factors ('something you know') like passwords, or inherence factors ('something you are') like biometrics, possession factors provide a tangible means of user authentication. This kind of factor can be easily demonstrated by presenting the object and, therefore, serves as a strong layer of security when used as part of multifactor authentication.
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What are examples of 'something you have' authentication factors?
How does 'something you have' differ from other authentication factors?
Why is 'something you have' considered a strong layer of security?