If the sensitivity of the halogen leak detector is constant throughout a test, and the pre- and post-test calibrations of the instrument were acceptable, which of the following is true upon completion of the test?

No leaks smaller than a certain size have gone undetected.

The total leakage rate of the test object is less than a certain amount.

The instrument and the test procedure were capable of detecting leakage of a certain size during the test.

The instrument and test procedure were only capable of detecting leakage of a certain size upstream of the tracer gas during the test.