Besides your computer, where else can you find and use an operating system?

Which if the following allows you to view and access important information about your documents all in one location

You are almost finished updating a web site. as part of the update, you have converted all pages from html 4.0 to html5. the project is currently on schedule. however, your project manager has been asked by the marketing team manager to justify a day of time spent validating the site's html5 pages. the marketing team manager does not have technical knowledge of the internet or the web. which is the most appropriate explanation to provide to the marketing team manager?

Are special combinations of keys that tell a computer to perform a command. keypads multi-keys combinations shortcuts