1. C is correct. When configuring an OSPF total stub area, the command doesn't need to be the same on all routers. Only the ABR needs the no-summary option....
2. ... but for regualar OSPF stub areas, the command will be the same on all routers. You need the area 2 stub command on each router, or you'll lose your adjacencies. OSPF neighbors must agree on the stub flag setting in order to form and keep adjacencies. In this case, A is correct.
3. Believe it or not, A is correct. An OSPF point-to-point network will have no DR or BDR, and you'll see a dash in the output of show ip ospf neighbor where you'd expect to see DR, BDR, or DROTHER.
Yeah, I didn't believe it either the first time I heard that. I'll post a video Sunday night to prove that I'm not crazy!
(Well, it might not go that far. But it will prove what I said about the dash!)
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