The following limitations of alarm and performance analysis methods are: (Multiple Choice)

The following limitations of alarm and performance analysis methods are: (Multiple Choice)
A . Field maintenance personnel cannot understand the current health of the equipment.
B . The network administrator cannot obtain any alarms, time, and historical alarms of the device.
C . When some faults occur, there may be no obvious alarms or performance events reported, and sometimes no alarms or performance events are found.
D . In the case of complex networking, service, and fault information, many alarms and performance events may occur along with the occurrence of faults. Due to too many reports and performance events, maintenance personnel are unable to analyze.

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Answer: CD