A network administrator wants to update a geofencing policy to limit remote access to the corporate network based on country location. Which of the following would the administrator most likely leverage?

MAC filtering is a security measure that allows or denies access based on the Media Access Control (MAC) addresses of devices. This method operates at the data link layer and is not effective for geolocation purposes, as MAC addresses do not provide information about the geographic location of a device.

Administrative distance is a concept used in routing protocols to determine the trustworthiness of routing information from different sources. It does not pertain to access control based on geographic location and is therefore irrelevant to the implementation of geofencing policies.

Bluetooth beacon signals are used for short-range communication and location tracking within close proximity, typically indoors. They are not suitable for managing access based on country location, as they do not extend beyond a limited range and do not provide the necessary geographic data for remote access policies.