What message indicates the strobe lights are turned off?

The message "STROBE LT OFF" clearly indicates that the strobe lights are turned off. This specific wording is consistent with the terminology used in aviation and aircraft systems, where notifications regarding light configurations are often abbreviated for clarity and brevity. The direct mention of "STROBE" in the message reinforces that it pertains specifically to the strobe lights, making it unmistakable for crew members monitoring the status of the aircraft's lighting systems.

Other options might appear logical at first glance, but they do not offer the same level of specificity. For instance, "STALE LIGHTS OFF" uses an incorrect term, while "NO LIGHTS ACTIVE" could imply that all lights are off, including navigation or landing lights, not just the strobe lights. "LIGHTS DISABLED" is also vague, as it does not specify which lights are affected. Therefore, "STROBE LT OFF" provides the most accurate and clear communication regarding the status of the strobe lights.