If memory is an issue rather than speed, and we have a sparse graph with a high number of vertices, it would probably be best to implement it with a(n):

Use document ________ to position a text box in a document

Fill in the blank(s) with correct word

You can customize a message by clicking on the ____ button to the right of a message in the editing area.

A. change detail B. select item C. add detail D. edit item