Why A is correct
PCI-DSS v4.0 requires a minimum of TLS 1.2 for encrypting cardholder data in transit. Earlier versions (TLS 1.0 and 1.1) are no longer considered secure.
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Encryption
Covers encryption 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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