Why D is correct
IEC 62443-2-1 specifies the requirements for establishing, implementing, maintaining, and improving an IACS security management system (CSMS).
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IEC 62443: Standards Framework & Series Overview
Overview of the IEC 62443 series, its parts (1-1 through 4-2), roles, and how the standard applies to industrial environments.
This question belongs to the "Standards Framework & Series Overview" domain, which makes up about 20% of the ISA/IEC 62443 exam.
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