If the link between routers is congested, so that RTA cannot receive the Keepalive message sent by RTB, which of the following consequences will occur?

The routers RTA and RTB have established a BGP connection and learned routes from each other. Both RTA and RTB use default timers.

If the link between routers is congested, so that RTA cannot receive the Keepalive message sent by RTB, which of the following consequences will occur?
A . After 30 seconds, RTA considers the neighbor to be invalid and deletes the route learned from RTB
B. After 90 seconds, RTA considers the neighbor to be invalid and deletes the route learned from RTB
C. After 120 seconds, RTA considers the neighbor to be invalid and deletes the route learned from RTB
D. After 180 seconds, RTA considers the neighbor to be invalid and deletes the route learned from RTB

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Answer: D