Option (1) is incorrect: Res judicata applies to suits and all other issues.
Option (2) is incorrect: Res judicata applies to suits and all other issues.
Option (3) is incorrect: Res judicata doesn’t apply to arbitration proceedings.
Option (4) is correct: The starting words of Section 11 of the Code of Civil Procedure states that no court shall try any suit or issue, which means that it includes suits and all other issues, including executing proceedings also.