Which technology can be employed to automatically detect a WAN primary link failure and failover to the secondary link?

Refer to the exhibit. Which technology can be employed to automatically detect a WAN primary link failure and failover to the secondary link?

300-101-implementing-cisco-ip-routing-route-v2-0_img_139

A. HSRP
B. VRRP
C. IP SLA
D. multicast

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