Which of the following involves the delivery of mails to a traveler without a fixed address

The option that involves the delivery of mails to a traveler without a fixed address is "Post restante". Poste restante is a service offered by many postal systems where a person can have mail held at the post office until they pick it up. The person addressing the letter writes the name of the recipient, followed by "Poste Restante," the name of the town or city where the post office is located, and the postal code or ZIP code. The recipient can then go to the post office, show identification, and collect their mail. This service is useful for travelers who don't have a permanent address or who don't want to receive mail at their current location.