The data warehouse of a company stores sales data for reporting reasons. Employees are not permitted to obtain consumers

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The data warehouse of a company stores sales data for reporting reasons. Employees are not permitted to obtain consumers' credit card information under data governance rules.

How can these rules be followed while yet allowing a Data Scientist to aggregate transactions using the same credit card number?

A. Store a cryptographic hash of the credit card number.
B. Encrypt the credit card number with a symmetric encryption key, and give the key only to the authorized Data Scientist.
C. Mask the credit card numbers to only show the last four digits of the credit card number.
D. Encrypt the credit card number with an asymmetric encryption key and give the decryption key only to the authorized Data Scientist.