What is a main beneft of data aggregation?

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What is a main beneft of data aggregation?
A . It is a good way to perform analysis without needing a statistician.
B. It applies two or more layers of protection to a single data record.
C. It allows one to draw valid conclusions from small data samples.
D. It is a good way to achieve de-identifcation and unlinkabilty.

Answer: D