Answer:
The correct option is;
Content controls
Step-by-step 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.