A typical modern computer uses

LSI chips
Vacuum tubes
Valves
All the above E. None of the above

The correct answer is: A. LSI chips.

LSI chips are large-scale integrated circuits that contain millions or even billions of transistors. They are used in a wide variety of electronic devices, including computers, smartphones, and

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cars.

Vacuum tubes are electronic components that were used in early computers. They are now obsolete, having been replaced by LSI chips and other solid-state devices.

Valves are devices that control the flow of fluids. They are not used in computers.

Therefore, the correct answer is A. LSI chips.