What are the four key functions of a computer system?
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input, processing, output, and storage
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keyboard, display, memory, and disk drive
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word processing, spreadsheets, database, and contact management
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read, write, calculate, and display
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bits, bytes, words, and OSI
A computer system needs input devices to receive data, processing (CPU) to manipulate it, output devices to present results, and storage to retain data and programs. Options B lists specific hardware examples but misses the functional categories. Option C lists application software, not system functions. Options D and E are incomplete or irrelevant.
The classic computing model describes any computer system by four core functions: input (getting data in), processing (computing on it), output (presenting results), and storage (retaining data). The other options describe specific hardware, software applications, or unrelated concepts rather than these fundamental functional categories.