Which statement about data type mappings is true in a federated system?

A.
The Oracle DOUBLE data type maps to the DB2 type FLOAT by default.

B.
Data types can be mapped in both directions between a remote and local data type.

C.
Cast functions can be pushed down to remote servers even if a counterpart function does not
exist there.

D.
For relational data sources, the degree to which you can override existing data type mappings
or create mappings is limited.

Explanation: