Option B is the way to go. Waiting for route updates is the most efficient way to implement policy changes. Unless, of course, you have a time machine and can just reboot the router before the exam. *wink*
I'm going to have to go with C on this one. Clearing BGP sessions or resetting BGP seems like the appropriate way to ensure policy changes take effect.
Option B seems like the most logical choice. Delaying policy changes until route updates are received from peers makes sense to ensure the changes are properly propagated.
Edison
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