When which of the following conditions are met, automatic protection switching of GPON Type B single-homing protection will be triggered? (Multiple choice)

When which of the following conditions are met, automatic protection switching of GPON Type B single-homing protection will be triggered? (Multiple choice)
A . Deterioration of quality of backbone optical fiber line
B . Branch fiber break
C trunk fiber break
C . OLT main POM port failure

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Answer: ACD