The correct answer is C. supervisory control.
Supervisory control and data acquisition (SCADA) is a control system architecture that uses computers and telecommunications to monitor and control remote physical processes. SCADA systems are used in a variety of industries, including energy, water, and transportation.
In SCADA, the control is supervisory, meaning that the human operator is in control of the process. The computer system only provides information to the operator and executes the operator’s commands. This is in contrast to automatic control, in which the computer system controls the process without human intervention.
The other options are incorrect because they do not accurately describe the control in SCADA. Online control is a type of control in which the computer system is constantly monitoring the process and making adjustments as needed. Direct control is a type of control in which the computer system directly controls the process without human intervention. Automatic control is a type of control in which the computer system controls the process without human intervention, but the computer system is not constantly monitoring the process.