Major innovations made from the establishment of abacus to the present 5th computer generation

He invented a calculating machine known as Leibniz's Wheel or the Step Reckoner. It could add and subtract, like Pascal's machine, but it could also multiply and divide. It did this by repeated additions or subtractions, the way mechanical adding machines of the mid to late 20th century did.

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the answer is you.

answer is:

a). backstage view

explanation:

backstage view is the area where files and data about them is managed— creating, saving, printing, sending to others, inspecting for hidden metadata or personal information, and setting options. so in this way we can add many things to our document swiftly.

i hope you get the idea.