You can set a controls border type to make the border invisible.

The correct answer is: B. Invisible

The other options are:

• A. Transparent: This would make the border see-through, but it would still be visible.
• C. Do not display: This would remove the border completely.
• D. No border: This is the same as option C.

Invisible borders are useful for creating a clean and modern look. They can also be used to make controls blend in with the background.