Which statement best describes a data warehouse?单项选择题

A

a centralised database that contains data in 3NF obtained from other databases inside and external to the organisation.

B

a read only system that contains all data copied 'as is' from OLTP databases

C

OLTP data is extracted and transformed (e.g. cleaned, summarised) before being stored in a centralised database

D

a big data database designed for all users in the organization to use

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