Which are NOT true? Select all that apply. A summons is a call to appear in court. Feudalism is a system of cooperation among peoples which was basically an exchange of gold for protection. A vassal was given the rights to control the fief and to have ownership of it. A knight may serve a vassal in exchange for land.

The correct answer is: letters "B", "C" and, "D" are false.

Explanation:

Feudalism was system - in the Middle Ages - based on cooperation among peoples in exchange of land for labor. In its structure, there were serfs, who worked the land owned by the king; the knights, who defended the landholder's territory; a vassal, who would govern the fief (land given to the vassal) but not own it and; the Lord, who would benefit from the work of the cooperative community.