Under what circumstance would a security guard be justified in using force to prevent a person from entering a restricted area on private property?

1. Only if the person verbally threatens the security guard.
2. If the person is unlawfully attempting to enter, has been clearly warned, and the force used is necessary and reasonable to prevent entry.
3. If the security guard believes the person might damage property, even without clear evidence.
4. Anytime a person attempts to enter a restricted area, regardless of warnings or intent.