Answer: Option D
Explanation: Big data is an area that deals with respects of analyzing, systematically extracting data from or otherwise dealing with sets of data that are far too significant or complicated to be handled by conventional software applications for data management.
We may not test when we handle big data, but simply watch and monitor what is happening. Big data also frequently include data with sizes that surpass conventional software's capacity to process in an appropriate time and cost.
Hence from the above we can conclude that the correct option is D.