Which of the following datasets derived from that data would be considered the most de-identified?

Aadhaar is a unique-identity number of 12 digits issued to all Indian residents based on their biometric and demographic data. The data is collected by the Unique Identification Authority of India. The Aadhaar database contains the Aadhaar number, name, date of birth, gender and address of over 1 billion individuals.

Which of the following datasets derived from that data would be considered the most de-identified?
A . A count of the years of birth and hash of the person’ s gender.
B . A count of the month of birth and hash of the person’s first name.
C . A count of the day of birth and hash of the person’s first initial of their first name.
D . Account of the century of birth and hash of the last 3 digits of the person’s Aadhaar number.

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Answer: D