What is an essential requirement for a theory?

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Capable of being testedCreated before conducting researchDerived solely from established factsRestricted to sociological contextsFocused only on specific issues

Explanation

For a theory to be scientifically valuable, it must be testable. This means it should be structured in a way that allows it to be evaluated through observation or experimentation. While theories can be developed before research, based on facts, or address specific issues, the critical criterion is their testability.