The security term that is concerned with the same primary key existing at
different classification levels in the same database is:

A.
Polymorphism.

B.
Inheritance.

C.
Polyinstantiation.

D.
Normalization.

Explanation:
The security term that is concerned with
the same primary key existing at different classification levels in the
same database is polyinstantiation.

Answer Polymorphism is incorrect because
polymorphism is defined as objects of many different classes that are
related by some common superclass; thus, any object denoted by this
name is able to respond to some common set of operations in a different
way.
Answer Normalization is incorrect because normalization refers to
removing redundant or incorrect data from a database.
Answer Inheritance is incorrect because inheritance refers to methods from a class inherited by
another subclass.