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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solution:

the right option is a

to adding   a new row to a table we   have to do process last table cell and pressing tab.

this is the process to add new row in the cell:

* to add a row below the cell, click insert below in the rows and columns group.

thus this is the required right answer.