Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to learn computer applications [title] Know what the software does. [step] This gives you an idea of which buttons are for what. Often title gives you hints.

Ending1: [title] Look at and read the entire open window. [step] Do not get tunnel vision on one portion of the window. Ending2: However, most software would have an opening or closing button with a number next to it. Even if it doesn't, there are some other functions you can think of. Ending3: [substeps] Windows: apply an application to a new computer. \ windows: turn on your computer by pressing start + r button. Ending4: If you think that a particular button means " troubleshooting " don't take it if it means " software problems. " [title] Use some of these tips : [substeps] Open a web browser.

Answer format: ending1/ending2/ending3/ending4