What are relationship labels?关系标签的含义是什么?:()?
（A）A relationship without cardinality.个没有基数的关联关系
（B）The verb phrases describing the business rules in each direction between two entities.用来描述两个实体之间在各个方向上业务关联规则的动词短信
（C）A foreign key that has been role-named.以角色命名的外键
（D）The nullability setting on a foreign key.设置为空值的外键
（E）A non-identifying relationship.一个非标识的关联关系 答案解析: 请P202，relationship，指两个实体之间的关联关系。
参考答案
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