1) What is the percentage of usage for each of the top 3 Operation systems ? 2) What is a Hierarchical Directory Structure ? Which is the name and year of the Operating System first to use a 'Hierarchical Directory Structure ? 3) What is the Name of the BIOS in your computer ? What utility did you run on your computer to get info about your computers BIOS 4) Which line command clears the screen in the: a. DOS CLI b. Linux CLI c. Mac CLI 5) Which line command lists files in the: a. DOS CLI b. Linux CLI c. Mac CLI 6) Which line command deletes a file in the: a. DOS CLI b. Linux CLI c. Mac CLI