Wildboards Company introduces a product called a Rollerboard for which it is granted a registered trademark. The Rollerboard is a snowboard with a removable row of wheels along the center of the underside. With the wheels attached, the user can attain extremely high speed in hard-packed snow conditions. In addition, many users have found that they can use their snowboards on streets with the wheels attached. This new use of snowboards becomes very popular and many competing snowboard makers introduce similar products. The sport becomes known generally as rollerboarding and most people refer to all wheeled snowboards as rollerboards. The consequence of this is that
a. Wildboards cannot stop competitors from using the term rollerboard for their products.
b. Competitors must pay royalties to Wildboards for using the term rollerboard.
c. Wildboards can no longer use the name Rollerboard on its boards.
d. Competitors must put a disclaimer on their boards that they are not the original Rollerboard.
