Mark works as a Database Administrator for DataOneWorld Inc. The company has a SQL Server database.
Management instructs him to verify the identity of a user or software that is connecting to the database. Which
of the following will help him to accomplish the task?

A.
Referential integrity

B.
Abstraction

C.
Encryption

D.
Authentication

Explanation:
Authentication is the process of verifying the identity of a user or software connecting to a database.
During the process of authentication,
the user must submit sufficient information validated either by the database itself, or by the operating system
within which the database is
installed.
Answer B is incorrect. Abstraction is a method of coding that enables a user to focus on the coding rather than
the syntax for a specific
database API. A user can use generic methods to access a database. In order to perform database
abstraction, a user requires additional
code or libraries. The benefit of database abstraction is that it provides a uniform interface for database
access.
Answer A is incorrect. Referential integrity is a feature or property that prevents users or applications from
entering inconsistent data
which, when satisfied, requires every value of one column of a table to exist as a value of another column in a
different or the same table.
Answer C is incorrect. Encryption provides an additional security layer, protecting the data from unauthorized
viewing with the help of
an algorithm called cipher. Even if access to the database is obtained, it will not be easy to decipher encrypted
data into a readable form.