Refer to the exhibit. What are two reasons for IP SLA tracking failure? (Choose two.)
A. The threshold value is wrong.
B. The destination must be 172.30.30.2 for icmp-echo.
C. The default route has the wrong next hop IP address.
D. A route back to the R1 LAN network is missing in R2.
E. The source-interface is configured incorrectly.
Correct Answer: AD