Which of the following will help limit unauthorized access to a mobile device?

Remote wipes erase data after unauthorized access has already occurred - they are a reactive control, not a preventive one.

Screen locks enforce authentication (PIN, password, pattern, or biometric) at the device level, blocking any user who does not have the correct credentials from accessing the device. This is the primary preventive control against unauthorized access. It is enforced locally and immediately without requiring network connectivity.

Geotracking monitors a device's location but does not restrict or prevent someone from using the device.

Antivirus software protects against malicious software and does not control who can log into or use the device.