When we talk about "Big Data" we are referring to a

to$.$

application that is used to analyze a broad set of data to support decision making, but only in the field of accounting.

b$.$

data set so voluminous and complex that it would be very difficult to manage and analyze it using only the traditional information technology systems that companies have as a basis.

c$.$

terabyte $(1$ TB$)$ of data.

d$.$

voluminous set of qualitative and unstructured data.