Concept:Charles Babbage designed early mechanical computing machines in the 19th century.Explanation:The two computing devices invented by Charles Babbage are the Analytical Engine and the Difference Engine.The Difference Engine was meant to compute polynomial tables automatically.The Analytical Engine was a more advanced, programmable general-purpose computer design.The Abacus and Slide Rule were not invented by Babbage; they were created earlier by other civilisations.Answer:D. Analytical and Difference Engines