After selecting multiple calendars, how do you view them in one single calendar? Open the Backstage view and then the Calendar options. In the Calendar view, click the Home tab, and click Combine. On the Home tab, click the Calendar tab, then the Merge button. In the Calendar view, click the View tab, and click the Overlay button.

its D. in the calendar view, click the view tab, and click they overlay button.

Explanation:

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professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).