During a recent OSPF election among three routers, RTA was elected the DR and RTB was
elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the
place of the DR while RTC becomes the new BDR.
What will happen when RTA comes back online?

A.
RTA will take the place of DR immediately upon establishing its adjacencies.

B.
RTA will take the place of DR only if RTB fails.

C.
RTA will take the place of DR only if both RTB and RTC fail.

D.
A new election will take place establishing an all new DR and BDR based on configured
priority levels and MAC addresses.

Explanation:
If a router with a higher priority value gets addedto the network, it does not preempt the DR and BDR. The only
time a DR and BDR changes is if one of them is out of service. If the DR is out of service, the BDR becomes
the DR, and the new BDR is selected. If the BDR is out of service, a new BDR is elected. In a multi-access
network, the router that is powered on first will generally become the DR, since DR/BDR process is notpreemptive