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A modern ICS is a complex system that depends on many different components and technologies to monitor and control physical processes; along with many of the managerial, administrative, and regulatory responsibilities associated with this task. The heart of ICSs are operations technology (OT) which supports availability and safety of critical processes. Modern-day ICSs have incorporated information technology (IT) based on the system functions desired in the overall system. For reference, definitions of each are as follows: