What indicates a firearm is safe to use?

The indication that a firearm is safe to use primarily revolves around its condition and proper functioning, which is why the correct answer focuses on having been inspected for these factors. An inspection ensures that the firearm operates correctly and is free of obstructions, excessive wear, or any other safety hazards that could cause malfunction. Regular maintenance and cleaning are also critical to the safe operation of a firearm, as residue build-up can lead to unsafe conditions.

While a safety switch may enhance the safety of a firearm when it is not in use, it does not guarantee that the firearm is safe to shoot. Lightweight does not have any bearing on safety; rather, it may influence handling or carry preferences. The use of a firearm in competitions does not inherently indicate it is safe to use, as it may not have been properly maintained outside of that context. Therefore, the key aspect of ensuring a firearm's safety lies in thorough and regular inspection to verify its operational integrity.