Which of the following devices is classified as an output device?

Output devices are designed to receive data or signals from a system and carry out a specific action based on those signals, often resulting in a physical response or the operation of other components within a system. In this context, a magnetic lock functions as an output device because it receives signals from a control unit or security system to engage or disengage. When activated, it locks or unlocks a door, providing a tangible outcome based on the input it receives from the control system.

In contrast, emergency break glasses and exit buttons serve primarily as input devices. They are meant to trigger a response when activated, such as alerting a control system or unlocking a door. A biometric reader and control primarily gather data (e.g., fingerprint or facial recognition information) and process it to determine access, which does not represent an output in the same way as a magnetic lock that acts on the input signals it processes.