Answer:
appurtenant
Step-by-step explanation:
This is like the right over someone's land for a specific reason or purpose.
It is legal and it is an easement where the right of use is attached to the land itself. The property that benefits from the easement is known as the dominant estate (which is Martin), while the property that is burdened by the easement is known as the servient estate (which is Carl) because it serves the dominant estate.