单项选择题

Exhibit 

Which command will ensure that Company2 will be the primary router for traffic using the gateway  address of 172.16.15.20? ()

A. On R2 add the command standby 1 priority 80
B. On R1 add the command standby 1 priority 110
C. On R1 add the command standby 1 priority 80
D. On R2 remove the command standby 1 preempt

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