When can a process server utilize "nail and mail" service?

The correct answer reflects that "nail and mail" service can be utilized when the person being served is not available at their residence. This method is specifically designed for situations where personal service cannot be achieved.

In "nail and mail" service, the process server typically attaches a copy of the legal documents to the door of the person's residence (the “nail” part) and then sends a copy of the documents through mail (the “mail” part). This method ensures that the individual is still informed of the legal action against them despite not being physically present to receive the documents directly.

This approach is generally considered acceptable in circumstances where traditional service methods have failed or where the server has made reasonable attempts to locate and deliver the documents to the individual in person. It cannot be used when the individual is readily available to be served, which supports the reason why the other options do not apply in this context.