How can you confirm that the fire system test has passed?

The statement "FIRE SYS OK" is a direct and concise indication that the fire system has passed its test. This phrase typically signifies that the system has undergone the necessary checks and has met the required operational standards without any issues. In the context of fire safety and system validation, such clear and unambiguous language is crucial.

This phrase clearly communicates the status of the fire system, leaving no room for misinterpretation. It demonstrates that the essential components of the system have been verified, and it is ready for operational use.

While the other options imply some level of success or operational status, they may not provide the same level of specificity or clarity necessary for critical systems like a fire safety mechanism. Hence, "FIRE SYS OK" serves effectively to convey that the test has been validated successfully.