A. compulsory
B. optional
C. voluntary
D. permissive
✅ The correct answer is option A.
compulsory : required by law or a rule; obligatory.
compulsory : required by law or a rule; obligatory.
optional : available to be chosen but not obligatory.
voluntary : done, given, or acting of one’s own free will.
permissive : allowing or characterized by great or excessive freedom of behaviour.
mandatory : required by law or mandate; compulsory.
Synonym of mandatory is compulsory