How long is data science course?

The answer to this is letter A. The information that can be found in the data warehouse is already too processed. There is a possibility that other details that could have been found raw and will provide better details for the whole task can be very useful.

Since there is too much data available, it will also be hard to segregate the data needed and the data that should not be part of the whole process in the first place. There are times when the data has already been manipulated in order to be beneficial for the one who is searching for the information. The fact that this is not entirely raw might produce inaccurate results.