The analysis layer reads the data digested by the layer massaging and store layer. In some cases, the analysis
layer accesses the data directly from the data source. Designing the analysis layer requires careful forethought
and planning. Decisions must be made with regard to how to manage the tasks to do which of the following?

A.
Reduce the volume of data

B.
Locate the data sources that can provide data for the required entities

C.
Identify multi-dimension data sources

D.
Identify data import and export tools to adopt and deliver an ETL strategy

Explanation:
http://www.ibm.com/developerworks/library/bd-archpatterns3/