【多选题】
A R1 becomes the active router.
B If R1 goes down, R2 becomes active but reverts to standby when R1 comes back online.
C R1 becomes the standby router
D If R2 goes down, R1 becomes active but reverts to standby when R2 comes back online.
E If R1 goes down, R2 becomes active and remains the active device when R1 comes back online.
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