Which of the following is categorized as "something you are" in the context of network security?

In the context of network security, "something you are" refers to biometric data, which is unique to each individual. Biometric authentication methods analyze distinct biological characteristics, such as fingerprints, facial recognition, or iris patterns, to verify a person's identity. This form of identification is tied to the physical person, making it a robust method of authentication.

In contrast, the other options—PINs, passwords, and digital signatures—are all examples of something you know or something you have, rather than something inherent to you. PINs and passwords rely on user knowledge and can be shared or compromised, while digital signatures represent a means of verifying the authenticity of a digital message or document but do not directly authenticate a user based on their inherent traits. As such, biometric data serves as a highly secure identification factor in the realm of network security.