When a field does not contain a value, either because that value is unknown or inapplicable, it is called a(n) ____ value.

________ is the process of modifying a presentation by adding and deleting slides or by changing the contents of individual slides

A) Editing B) Saving C) Presenting D) Formatting

The body of a selected message in Windows Mail will display in the ________

Fill in the blank(s) with correct word