CLIs are often used by programmers and system administrators, in engineering and scientific environments, and by technically advanced personal computer users.
        
             
        
        
        
Answer:a wavy red line
Explanation:
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Answer:
When you open a program, the hard drive <u>Registers the program and runs the program accordingly. </u>
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The answer is Multitasking. NOS (Network Operating System) has the ability to execute more than one program at a time.  It allows different programs to operate on the CPU, effectively giving each program a virtual copy of the CPU while preventing the program from directly manipulating the hardware. The NOS switches the CPU time from one task  to another in order to create the idea that several tasks are being executed at the same time, but in reality, only one program is being executed.