Why B is correct
Requirement 3 focuses on protecting stored cardholder data through encryption, masking, truncation, hashing, and other methods to render the PAN unreadable.
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Cardholder Data
Covers cardholder data concepts and practices within PCI DSS.
This question belongs to the "Protect Cardholder Data" domain, which makes up about 20% of the PCI DSS exam.
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