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All of the following are TRUE statements on relationship types except:下面关于关系的陈述都是正确的，除了::()?

（A）A one-to-many relationship says that a child entity may have one or more parent entities.一对多关系，描述了一个子实体有一个或多个父实体

（B）A one-to-one relationship says that a parent entity may have one and only one child entity.一对一关系，描述了一个父实体只有一个子实体

（C）A one-to-many relationship says that a parent entity may have one or more child entities.一对多关系，描述了一个实体有一个或多个子实体

（D）A many-to-many relationship says that an instance of each entity may be associated with many instances of the other entity, and vice versa.多对多关系，讲述了每一个实体实例之间，都会关联着其它多个实体的实例，反之亦然

（E）A recursive relationship relates instances of an entity to other instances of the same entity.递归关系讲述了同一个实体不同实例之间的关系 答案解析: 这是数据建模的内容，该题中“A one-to-many relationship says that a parent entity may have one or more child entities.”与“A one-to-many relationship says that a parent entity may have one or more child entities.”肯定有一个错了，见下图: 如上图模型，班级是父，学生是子，一个班级可以有多个学生，所以应该是“A one-to-many relationship says that a parent entity may have one or more child entities.”，而不是“A one-to-many relationship says that a parent entity may have one or more child entities.”(注意，这题是要选错的)