1. Both C and D are correct. If you use the aggregate-address command with no additional options, you'll get the aggregate route and it will be advertised, but the more-specific routes will ALSO be advertised. To get the aggregate route without the more-specific routes continuing to be advertised, use the summary-only option with that command.
2. The third factor is the preference of a locally originated route.
3. C and D are correct. There's no problem with a BGP route having a next-hop of 0.0.0.0, and this can indicate a route learned by route redistribution or a locally originated route.
That's it for today! Weather permitting, I'll see you with a new video on Thursday!
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