What were the duties of the vassals?

What were the duties of the vassals?
 
  A) To the lord, a vassal will serve on the lord's court, fight in battles, guard the lord's fortress, and provide financial assistance.
  B) The vassals protected the inhabitants of the fief, dispensed justice, and collected taxes
  C) The responsibility of the vassal was to provide financial support for large projects within his fiefdom and aid the lord in warfare.
  D) The responsibility of the vassal was to first obey God and then his lord.
  E) The vassals protected the inhabitants of the fief, dispensed justice, and collected taxes. To the lord, a vassal will serve on the lord's court, fight in battles, guard the lord's fortress, and provide financial assistance.