The answer B. a switchboard
C)Hydroelectric I believe.
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Hope This Helped <3
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The Microsoft button was exclusively used in the 2007 versions of word, excel, powerpoint, access and outlook. It has all of the different options like to save, print, open ect. It was located in the top left hand corner of the screen. It looked a bit like this (see attachment).
The central processing unit (CPU) is what powers the computer. Any lower-end CPUs will not run a quick-functioning computer very well.