Which of the following best defines control technology?

Control technology refers to systems and devices used to manage, regulate, and automate processes, often in industrial or manufacturing settings.

Let's evaluate the options:

• A. the collection, storage and processing of information by electronic means: This describes information technology (IT) in general, not specifically control technology.
• B. IT governance to manage the risks and constraints of IT: This describes a framework for managing IT resources and risks, which is a broader concept than control technology.
• C. network systems in which computers are linked to one another over a network: This describes computer networking, which is a component of many IT systems but not the definition of control technology itself.
• D. specific computer-based production control systems: This accurately describes control technology, which is often implemented using computers to monitor and regulate production processes, machinery, and other operational aspects to ensure efficiency, safety, and quality. Examples include SCADA systems, PLCs, and DCS.

The correct option is D.
$\boxed{\text{D. specific computer-based production control systems}}$

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