Which two mechanisms can provide fast Layer 2 down detection in Frame Relay networks? (Choose two.)

Which two mechanisms can provide fast Layer 2 down detection in Frame Relay networks? (Choose two.)
A . asynchronous LMI
B . millisecond LMI timers
C . A-bit signaling
D . Frame BFD Lite
E . section 9 LMI convergence

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Answer: AC