What enabled the development of multiprogramming?

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Operating system softwareInput/output devices functioning independently from the CPUA combination of both operating systems and independent I/O unitsNeither operating systems nor independent I/O units

Explanation

Multiprogramming became feasible due to the presence of operating systems that manage multiple programs and input/output units that operate separately from the CPU, allowing efficient multitasking. Therefore, both factors contributed to enabling multiprogramming.