C is correct
Areas are identified through a 32-bit area field; thus, Area ID 0 is the same as 0.0.0.0
I think the whole purpose of this question is to test your knowladge of this information.
https://www.sciencedirect.com/topics/computer-science/backbone-area#:~:text=Areas%20are%20identified%20through%20a%2032%2Dbit%20area%20field%3B%20thus%2C%20Area%20ID%200%20is%20the%20same%20as%200.0.0.0.
I will go for A because the C goes in the router ospf mode first, actually is not needed, you can go directly to the interfaces and activate ospf.
The A one is more correct in therm of what you are doing based on the commands inserted, actually the network staatement just enable ospf in the interface is the same thing, but here we can see that there is a motivation of going in the ospf vrf process
Option C seems like the best bet seeing as "Interface" was stressed in the question
Both configuration works as already highlighted by others, however, "show ip protocols" shows option A's configuration under "Routing for networks" whereas it shows option C's configuration under "Routing for Interfaces configured explicitly for Area:"
I think the idea behind the question is which of the 2 configuration commands put the interface under the explicit configuration in "show ip protocols"
Option A is intentionally meant to sway, because it uses the Interface IP address rather than the network address, however it does not show under explicit interface configuration in "show ip protocols"
I also labbed it in CML. Same result as for Huntkey. Both "A" and "C" work. "A" uses 0.0.0.0 wildcard masks in the network statement, so ospf is enabled only on a specific interface. "C" is associating the ospf process directly under the interface configuration. Both solutions seems to be OK.
I'm leaning toward C as both A and C are valid configs. I think the key word in the question is 'interfaces', SOPF needs to enabled on interfaces only.
I would tend to agree, but the network statements in A use 0.0.0.0 wildcard masks and thus can only apply to the IP addresses of the interfaces themselves. I suppose you could take it a step further and say that if you changes the IP on the interface then the network statement wouldn't apply anymore, but that seems unlikely. I don't love this question.
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