Which of the following is the lowest in the hierarchy of feudal system?

Serfs were the lowest in the hierarchy of the feudal system. Serfs were peasants who were tied to the land they worked on and were obligated to provide labor services, pay rent, and give a portion of their produce to the lord of the manor. They were not allowed to leave their land without permission and had no legal rights. Knights were higher in the hierarchy and were granted land by the lord of the manor in exchange for military service. Nobles and lords were at the top of the hierarchy and owned large estates and had significant political power.