A persistent collection of data items that form relations among each
other is called a:

A.
Schema

B.
Database management system (DBMS)

C.
Database

D.
Data description language (DDL)

Explanation:
For a database to be viable, the data items must be stored on nonvolatile
media and be protected from unauthorized modification. For
answer a, a DBMS provides access to the items in the database and maintains the information in the database.
*The Data description language (DDL) provides the means to define the database and schema is
the description of the database.