decibels i believe is the correct answer. hope it helps :)
Answer:
Mouse and Keyboard are the devices which can be used to give input to the computer.
Explanation:
Mouse and Keyboard both are connected with the CPU via USB cable. Mouse consists of 3 major buttons, left button(for click to get the task to be done), right button (to get options) and wheel (to scroll up and down the page on screen). Keyboard is use to type text and letters as per need.
My opinion is the answers A and D. I would choose A if you can only choose one, though.
By looking up your research on websites that have (.org) or wikipedia for answers u might have to find information
