In a network design using carrier Ethernet, which three mechanisms can be used to improve Layer 2 down detection and thereby reduce routing convergence time? (Choose three.)

In a network design using carrier Ethernet, which three mechanisms can be used to improve Layer 2 down detection and thereby reduce routing convergence time? (Choose three.)
A . BFD
B . Ethernet port debounce timers
C . link-state tracking
D . object tracking
E . fast IGP hello

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Answer: ADE