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Which feature can R1 use to fail over from R2 to R3 if the address for R2 becomes unavailable?

Refer to the exhibit. Which feature can R1 use to fail over from R2 to R3 if the address for R2 becomes unavailable?

400-101-ccie-routing-and-switching-written-exam_img_381
A. object tracking
B. HSRP
C. GLBP
D. LACP