Why A is correct
PCI DSS requires passwords to be at least seven characters long, containing both numeric and alphabetic characters (PCI DSS v3.2.1). PCI DSS v4.0 increased this to 12 characters.
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Access Control
Covers access control concepts and practices within PCI DSS.
This question belongs to the "Access Control Measures" domain, which makes up about 15% of the PCI DSS exam.
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