The correct answer is B. inset.
The outline
property specifies the outline of an element. The outline is a line that is drawn outside of the element’s border. The inset
value specifies the amount of area extended beyond the border box.
The outset
value specifies the amount of area extended beyond the border box in a 3D fashion.
The inset3d
value specifies the amount of area extended beyond the border box in a 3D fashion, with the top and bottom edges being inset.
Here is an example of an element with an outline:
“`html
style="outline: 1px solid red;"> This is a div with an outline.