Answer: c. All of these
Explanation:
Business analysis is difficult from operational databases for quite a number of reasons which include but are not limited to:
i. Every department having its own method for recording data - there is a misalignment of data definitions across differnent departments which means that users might not be able to compare data effectively.
ii. Data standards not applying across departments - Different departments usually use different formats to record data again making comparison difficult.
iii. The data, if available, often being incorrect or incomplete - missing data across departments due to lack of set standards can again make comparisons difficult.
Therefore all of the options are correct.