I think the answer should be BCD as SQL is used for both RDBMS and Object Oriented DB. Regarding atomicity and consistency, I think that is facilitated by the RDBMS engine.
A is also true my reference is https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/Hierarchical-Queries.html#GUID-0118DF1D-B9A9-41EB-8556-C6E7D6A5A84E
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