Which of the following statements about incident optical power commissioning are true?

If the output optical power of the downstream OA does not meet requirements in the case of the minimum gain, reduce the attenuation value of the upstream EVOA first to a value within the range required by incident optical power counters.

If the output optical power of the downstream OA still does not meet requirements, increase the gain of the downstream OA.

By default, the incident optical power of each optical fiber is the special incident optical power (high power).

If the output optical power of the downstream OA meets requirements in the case of the minimum pain, the upstream incident optical power cannot be lower than the incident optical power counters.