In the GPON network, to measure the luminous condition of the ONU, which of the following options is correct?

In the GPON network, to measure the luminous condition of the ONU, which of the following options is correct?
A . Optical power string through PON network to PON network, using 1490 nm to measure
B . Measure the optical power of the PON network directly into the ODN, using 1310 nm to measure
C . Directly connect to ONU’s PON port for measurement by optical power meter
D . Turn on the ONU’s long light switch by command and then use the optical power measurement

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Answer: C