A is correct answer.
Capability SLs (SL-C) are the security levels that components or systems can provide when properly configured. These levels state that a particular component or system is capable of meeting the target SLs natively without additional compensating countermeasures when properly configured and integrated.
In the context of ISA/IEC 62443, the capability security level refers to the level of security a component or system is capable of meeting based on its design, features, and inherent capabilities. This level indicates the maximum security functionality that the system or component can achieve when properly configured and integrated.
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