Correct - A and D according NSE7_EF_6.2 Manual p.289
A. Router ID is 0.0.0.4
B. It is not backup designated router (state DROther)
C. Only 2 out of 4 routers are adjecent, but the others are not down - just not adjacent
D. Area for port4 is 0.0.0.0 (backbone area)
OSPF routers on a broadcast network will elect a DR (designated router) and BDR (backup designated router) with which all non-designated routers (like this) will form an adjacency. That is why we see 2 adjacent neighbors.
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