What Does the Phrase "Big Data" Refer To

What does the phrase "big data" refer to?

A) It refers to the information collected by the top five firms in the marketing research industry.
B) It refers to the data sets too large and complex to work with typical database management tools.
C) It refers to the information received from market research studies but not internal sources.
D) It refers to the marketing research data taken from Internet sources.
E) It refers to the market information taken from the U.S.Census.