Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）<br>A:The generator and bus transfer section<br>B:The 450 volt, 60 cycle, 3 phase bus<br>C:The 120 volt, 3 phase, 60 cycle bus<br>D:The 24 volt DC bus

Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）
A:The generator and bus transfer section
B:The 450 volt, 60 cycle, 3 phase bus
C:The 120 volt, 3 phase, 60 cycle bus
D:The 24 volt DC bus

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