Which of the following statement about the configuration, testing and maintenance of the IPA function is correct? (Multiple choice)

Which of the following statement about the configuration, testing and maintenance of the IPA function is correct? (Multiple choice)
A . IPA function is only applicable to Raman amplifier, not to ordinary amplifier
B . After the IPA function is successfully activated, when the amplifier board detects LOS, the optical power of its output port becomes safe optical power
C . Select "Configuration/IPA Management" in the function tree of the NE Manager to configure the value of the IPA startup delay
D . When the fiber interruption is repaired and IPA cannot be ended, it may be because the IPA protection group is not configured with a “detection board” and only the auxiliary detection board is configured. The auxiliary detection board reports an alarm that triggers IPA
E . The purpose of testing the IPA function is to verify that if any fiber in the IPA pair contains a fiber break, the amplifier included in the IPA pair can be turned off. After the fiber break is restored, the amplifier can be automatically turned on and the power changes Within 0.5d

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Answer: BCDE