Which of the following is commonly used in biometric identification systems?

Fingerprint recognition is commonly used in biometric identification systems because it leverages unique biometric traits of individuals to verify their identity. This method analyzes the unique patterns of ridges and valleys found in a person's fingerprints, allowing for a high level of accuracy in identifying individuals. The use of fingerprints in biometric systems offers benefits such as permanence, ease of use, and low cost of implementation. Unlike other identification systems, which may rely on external objects or codes, fingerprint recognition directly measures a physical attribute of the individual, making it a secure choice for authentication.

Other options, while useful in various identification contexts, do not belong to biometric systems. Barcode scanning relies on optical codes printed on surfaces and requires the user to have a physical item, meaning it does not authenticate based on biological characteristics. Similarly, magnetic stripe cards use stored magnetic data for identification, which is also not a biometric method. Lastly, color matching systems do not pertain to personal identification but rather involve comparing colors for various applications, lacking the individual-based authentication characteristic central to biometric identification.