{"knowledge_schema": {"broad_category": "Physics \u2192 Quantum Field Theory \u2192 Effective Field Theories", "refinement": "This problem pertains to the symmetries that must be respected by operators in the Standard Model Effective Field Theory (SMEFT).", "specific_scope": "The focus is on identifying which symmetries are fundamental and must be preserved in the formulation of operators within the SMEFT framework.", "goal": "Determine the correct set of symmetries that all operators in the SMEFT must respect."}, "summary": "In the context of the Standard Model Effective Field Theory (SMEFT), operators must respect certain fundamental symmetries. The correct answer identifies Lorentz symmetry, Poincare symmetry, and CPT symmetry as essential, while CP symmetry is not universally required for all operators. Therefore, the answer is that operators in the SMEFT must respect symmetries 1, 2, and 4."}