What can users provide to verify their identity according to authentication principles?

The correct answer highlights the multifaceted approach to authentication that enhances security by requiring different types of factors. When users verify their identity, they can utilize three distinct categories of authentication factors: something they know (knowledge), something they have (possession), and something they are (biometrics).

Knowledge factors typically include passwords or personal identification numbers (PINs). Possession factors might consist of security tokens, smart cards, or mobile devices that generate verification codes. Biometric factors encompass unique biological traits, such as fingerprints, facial recognition, or iris scans.

By implementing a combination of these factors, organizations can significantly reduce the risk of unauthorized access. This layered security approach is considered much more effective than relying on a single method of authentication, such as only a username or just a password. Therefore, combining knowledge, possession, and biometric verification creates a more robust identity verification process, making it the best choice.