A. No, for every loading, the definition of the tables used, their columns, and their constraints must be manually built.

B. No, an external engine must be run in order to describe what metadata is needed for an O interface.

C. Yes, their definition is imported with a direct reverse-engineering process.

D. Yes, their definition is imported with a direct reverse-engineering process, but you must manually define all the keys and constraints existing on the database.