Explanation:
A Primary Key uniquely identifies each record and does not allow nulls. Indexed improves search, Required forces data entry, Validation Rule checks input.
Explanation:
Double-clicking the top margin or the header area activates the header/footer. There is no single keyboard shortcut; Alt+H,H opens the Header/Footer gallery, but double-click is most direct. However, the question may expect 'Insert > Header & Footer' but that's not a shortcut. I'll choose the most common method: double-click.
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