Which is an example of an input device? A. Printer
B. Monitor
C. Speaker
D. Microphone

D. Microphone

Explanation:

The answer is microphone because the information(sound) is sent into the computer while the printer, monitor and speaker transmit the information out of the computer to humans to understand.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)