. . . . . . . . is used to differentiate the one redio button group to another radio button group.

bottom
top
dim
frame

The correct answer is: group name.

A radio button group is a group of radio buttons that share the same name. The name of the radio button group is used to differentiate the one radio button group to another radio button group.

The other options are incorrect because:

  • bottom and top are not used to differentiate radio button groups.
  • dim is a CSS property that is used to make an element appear dimmer. It is not used to differentiate radio button groups.
  • frame is a HTML element that is used to create a frame around an element. It is not used to differentiate radio button groups.