Mod Clothing,Inc

Multiple Choice

Mod Clothing,Inc. ,and Natty Denim Corporation use the mark "Made by Members of the U.S.Textile Workers Union" on the tags of their products to indicate the participation of the union in the manufacture.Mod and Natty are not in business together and do not own this mark.The mark is

A) a certification mark.
B) a collective mark.
C) a service mark.
D) trade dress.