From inside Room I, Bill overheard the following conversation between a group of humans (from Earth 1), who gathered near a job fair in the premises of “The Hall of Operations”, with a banner which read “Vacancies open for numbers which are closed under addition”: Supriya (looking at the banner): What does “closed” in the banner mean? Ajit (with a poker face): If a set of numbers is closed for a particular operation, then it is said to possess the closure property under that operation. Supriya (unimpressed): That’s just a textbook definition. I want to understand what that actually means. Arjun: Supriya, a set of numbers is said to be closed under a particular mathematical operation when the result of that operation also belongs to the same set of numbers. Supriya then made 4 statements, each of which is presented in the following options. Chose the correct options made by Supriya. She might make more than one correct statement.