Any relation with two attributes is in BCNF

A relation in which every key has only one attributes is in 2NF

A prime attribute can be transitively dependent on a key in 3 NF relation

A prime attribute can be transitively dependent on a key in a BCNF relation

conceptual level data hiding

physical level data hiding

external level data hiding

none of these

integrity constraint

referential constraint

over-defined constraint

feasible constraint

Report writer

Query language

Data manipulation language

Transaction log

revising the file structure

reorganizing the database

modifying or adding record occurrences

All of these