Which of the following describe Data Warehouses? (select all that apply)

a) Has a purpose to combine strategic information into a single repository in such a way that people who need that information can make decisions and undertake business analysis.
b) A subset of information from a Datamart.
c) A process that transforms data from internal and external databases using a common set of enterprise wide definitions.
d) Supports business analysis activities and decision making tasks.
e) A logical collection of information gathered from many operational databases.