D is corrent. The requirement is to identify the component that provides the instructions to the operating system to schedule, allocate resources, and retrieve data. D is corrent because the job control language is a command language that specifies priority, program size, and running sequence.
A is incorrect because peripheral processors are processors that supplement the central processor.
B is incorrect because a concentrator is a communication channel.
C is incorrect because a multiplexer is a logic circuit that sends several inputs over a single channel.
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