Which of the following is the MOST critical and contributes the greatest to the quality of data in a data warehouse?

A.
Accuracy of the source data

B.
Credibility of the data source

C.
Accuracy of the extraction process

D.
Accuracy of the data transformation

Explanation:
Accuracy of source data is a prerequisite for the quality of the data in a data warehouse. Credibility of the data source, accurate extraction processes and accurate transformation routines are all
important, but would not change inaccurate data intoquality (accurate) data.