What need to be added to the R1 configuration to allow R2 be the active in case of R1 failure? (Choose two)

What need to be added to the R1 configuration to allow R2 be the active in case of R1 failure? (Choose two)

(There is a diagram showing one switch connected with 2x links to 2x HSRP routers (R1 and R2). They are connected to two user computers. The HSRP configuration for R1 and R2 is the same.
A . ip track 50 ip route 10.1.1.0 …
B . ip track 50 interface f01 line-protocol (or ip routing)
C . track 50 decrement 20
D . track 50 shutdown

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Answer: B, C