When router 1 f0/1 (outside interface) down. With which tracking commands the Router 2 will be able to preempt?

ccdp

#1

HSRP. Router 1 (master) and Router 2 (standby), same priority. When router 1 f0/1 (outside interface) down. With which tracking commands the Router 2 will be able to preempt ? (Choose Two)

A. Track 50
B. Track 50 decrement 20
C. ip tracking 50 interface f0/1 reachability
D. ip tracking 50 Interface f0/1 ip routing (or line protocol)

Correct Answer: BD