Answer:
The correct option is;
Content controls
Explanation:
Content controls are customizable controls that can be added to forms, templates and document that enable users to identify or preview the expected data that fills a given form field
Content controls can be in the form of instructional text that give users an idea of the expected format of the content of a given form field, such that the text disappears as soon as the user starts typing in their own text.
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Answer:
flight stimulators are used to train astronaut and design simple air craft