Which of the following descriptions about PTN and TPS protection are correct? (Multiple choice)

Which of the following descriptions about PTN and TPS protection are correct? (Multiple choice)
A . The object of TPS protection is the interface board
B. The object of TPS protection is the service sub-card and the motherboard on which the service sub-card is inserted
C. The service sub-card protected by TPS must use the interface board to go out
D. The interface board protected by TPS can be D12, D75, ETFC
E. The HARD_BAD alarm reported by the protected board will trigger TPS switching
F. The BD_STATUS alarm reported on the protected board will trigger TPS switching

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Answer: BCEF