How does k-anonymity help to protect privacy in micro data sets?

How does k-anonymity help to protect privacy in micro data sets?
A . By ensuring that every record in a set is part of a group of "k" records having similar identifying information.
B. By switching values between records in order to preserve most statistics while still maintaining privacy.
C. By adding sufcient noise to the data in order to hide the impact of any one individual.
D. By top-coding all age data above a value of "k."

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Answer: A