how would you describe data warehousing to the customer?

If a customer is planning on building a data warehouse, how would you describe data warehousing
to the customer?

A.
The data in the data warehouse describes events and statuses of business processes,
products and services, goals and organizational units, and generally mirrors every aspect of the
structure and behavior of the organization.

B.
Data warehouses can only be based on multidimensional data modeling.

C.
Application based data warehouses can be bought off the shelf and used without any tweaking.

D.
Data warehouse projects are usually implemented within two weeks.

Explanation:
A data warehouse is a database used for reporting and data analysis. It is a central
repository of data which is created by integrating data from multiple disparate sources. Data
warehouses store current as well as historical data and are commonly used for creating trending
reports for senior management reporting such as annual and quarterly comparisons.