What is a subject-oriented, integrated, time-variant, non-volatile
collection of data in support of managements decision-making
process?

A.
Data mart

B.
Data model

C.
Data warehouse

D.
Data model

Explanation:
This definition of a data warehouse is that of Bill Inmon, a pioneer
in the field. To create a data warehouse, data is taken from an operational
database, redundancies are removed, and the data is cleaned
up in general. This activity is referred to as normalizing the data.
Then the data is placed into a relational database and can be analyzed
using On-Line Analytical Processing (OLAP) and statistical modeling
tools. The data warehouse can be used as a Decision Support System
(DSS), for example, by performing a time series analysis of the data.
The data in the data warehouse must be maintained to ensure that it
is timely and valid. The term data scrubbing refers to maintenance of

the data warehouse by deleting information that is unreliable or no
longer relevant.
*A data mart, answer a, is a database that is comprised
of data or relations that have been extracted from the data warehouse.
Information in the data mart is usually of interest to a particular
group of people. For example, a data mart may be developed for
all health care-related data.
*Answers Data model and Data model are distracters, although
a data model, in this context, sometimes refers to the result of analyzing
relationships among enterprise-wide data items.