Actually, I put the concept of B into practice on hundreds of routers where i configure OSPF.
I actually hate doing blanket ospf network configs that cover /24s and such. doing network x.x.x.x 0.0.0.0 area Y is actually safer and best practice.
Think about if you have multiple 10.x.x.x networks that are subnetted 50 ways to sunday and you make a new 10.x.x.x network on that router, all of a sudden its now part of OSPF. F that bro, if i want it a part of OSPf, ill add the network statement to my router config with the 0.0.0.0 wildcard mask.
Confirmed by test in my lab:
R1#sh run | sec ospf
router ospf 1
log-adjacency-changes
auto-cost reference-bandwidth 1000
network 0.0.0.0 255.255.255.255 area 0
R2#sh run | sec ospf
router ospf 2
log-adjacency-changes
network 20.0.0.0 0.0.0.255 area 0
network 20.1.1.2 0.0.0.0 area 0
R2#
R2#
R2#
R2#sh ip os nei
Neighbor ID Pri State Dead Time Address Interface
20.1.1.1 1 FULL/DR 00:00:32 20.1.1.1 GigabitEthernet0/0
R2#
B is a good option, it is referring to a network /32, which a network of one single IP address, so, OSPF will be tried it neighboring on network 20.1.1.2/32
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