Which of the following is NOT a main component of an electronic access control system?

An electronic access control system is primarily composed of several key components that work together to manage and regulate access to secured areas. Access cards or fobs are used to grant individuals the ability to enter certain areas and are essential for the system to function. Card readers are devices that authenticate these access cards or fobs, verifying whether access should be granted to an individual. The access control panel serves as the central hub that processes the information from card readers and makes decisions about allowing or denying access.

In contrast, while Wi-Fi routers can support network connectivity, they are not a fundamental component of an access control system. Wi-Fi may facilitate communication between various components, but it is not directly involved in the functionality required to control access. Therefore, it does not fall under the main components necessary for the basic operation of an electronic access control system.