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The correct answer is **c. An operation performed on members of that set will result in a member of the same set.**
In mathematics, a set is said to be "closed" under a specific operation (such as addition, subtraction, multiplication, or division) if applying that operation to any elements of the set results in an element that is also in the set. For example, the set of integers is closed under addition because the sum of any two integers is also an integer.