Which of the following is a type of physical lock used for securing entry points?

A deadbolt is a type of physical lock specifically designed to secure entry points by providing a robust locking mechanism that typically features a solid metal bolt. When engaged, a deadbolt extends into the door frame, making it substantially more difficult to force the door open compared to standard spring bolt locks. This enhanced security is especially beneficial for securing residential and commercial entrances, as it helps prevent unauthorized access.

Other options like biometric scanners and electronic access control are primarily electronic systems that may not involve a traditional physical locking mechanism, focusing instead on identifying users based on unique physical traits or managing entry through electronic means. The smart doorbell, while an innovative device for enhancing home security, serves to monitor and communicate with visitors rather than functioning as a physical lock. In contrast, a deadbolt is a classic and effective choice for providing physical security at entry points.