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a) Charles Babbage b) Alan Turing c) Bill Gates d) Steve Jobs Answer: a) Charles Babbage

If you cannot access the Arihant book immediately, here are free alternatives to keep your preparation moving:

containing an overview of history, generations, and classifications is available on Academic Notes

If you absolutely cannot find a legit copy of Arihant, here are other excellent resources (some are 100% free and legal):