The correct answer is C. Form design.
In Access, the Form Design view is used to create and modify the structure of a form. This view allows you to add, delete, and rearrange controls on a form, as well as change the properties of those controls. You can also use the Form Design view to add and modify form sections.
The Normal view is used to create and modify tables, queries, and reports. The Datasheet view is used to view and edit data in a table or query. The Control view is used to add, delete, and rearrange controls on a form.
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