Which of the following is used in database information security to hide information?

A.
Inheritance

B.
Polyinstantiation

C.
Polymorphism

D.
Delegation

Explanation:
Polyinstantiation represents an environment characterized by information stored in
more than one location in the database. This permits a security model with multiple levels-of-view
and authorization. The current problem with polyinstantiation is ensuring the integrity of the
information in the database. Without an effective method for the simultaneous updating of all
occurrences of the same data element – integrity cannot be guaranteed.