In a relational database, security is provided to the access of data through:

A.
Candidate keys.

B.
Views.

C.
Joins.

D.
Attributes.

Explanation:
The correct answer is Views. Candidate keys, are the set of
unique keys from which the primary key is selected. Answer joins
indicates operations that can be performed on the database, and the
attributes denote the columns in the relational table.