Match each argument term with its defining feature.

### The pairs | Item | Matches | Why | |---|---|---| | Valid | True premises cannot lead to a false conclusion. | Validity is a property of logical form, tested by asking whether a counterexample with true premises and a false conclusion is possible. | | Sound | Valid argument with all premises actually true. | Soundness combines valid structure with factual truth of every premise. | | Invalid | A possible case has true premises and a false conclusion. | Such a case shows that the premises do not guarantee the conclusion. | | Unsound | Fails at least one requirement for soundness. | An argument is unsound if it is invalid, has a false premise, or both. | ### The concept Validity and invalidity classify logical support. Soundness and unsoundness assess whether an argument meets the additional factual condition. These categories are related but not interchangeable: every sound argument is valid, while an invalid argument is automatically unsound. An unsound argument may still have a true conclusion, since the issue is whether it earns that conclusion through valid reasoning from true premises. ### Terms - **Counterexample**: A case showing that an argument's premises can be true while its conclusion is false. - **Premise**: A statement intended to support a conclusion. - **Conclusion**: The statement an argument attempts to establish. ### Remember A counterexample tests validity; checking premise truth tests soundness.