Answer:
Lein Theory.
Step-by-step explanation:
Lien theory refers to the theory in which the buyer stops the property deed at the time of the mortgage. Also the buyer promised to pay all the payments so that the mortgage could become a lien on a property but at the same time the title would remain with the buyer but if all the payments are paid so the lien could be removed
Therefore in the given situation, it represents the lien theory