單項選擇題

You want to implement a high availability network using two Cisco routers. You also want to  ensure that the stat of the WAN interfaces can be tracked in doing so. 
Which router redundancy  protocol cannot be configured for interface tracking? ()

A. GLBP
B. HSRP
C. RPR
D. VRRP
E. SLB
F. RPR+
G. None of the other alternatives apply

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