Which of the following BEST describes why vulnerabilities found in ICS and SCADA can be difficult to remediate?

Which of the following BEST describes why vulnerabilities found in ICS and SCADA can be difficult to remediate?
A . ICS/SCADA systems are not supported by the CVE publications.
B . ICS/SCADA systems rarely have full security functionality.
C . ICS/SCADA systems do not allow remote connections.
D . ICS/SCADA systems use encrypted traffic to communicate between devices.

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Answer: A