一企业在同类商品上注册了一系列相似的商标,主要使用的商标为“乐口福”,其他相似商标为“口福乐”、“乐福口”,这些相似商标被称为()
A.防御商标
B.证明商标
C.集体商标
D.联合商标
正确答案是D
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