The role of the Conceptual data model in the Metadata repository is概念模型在元数据存储库中的作用是::()?
（A）To determine how many records are stored for each conceptual data entity决定有多少记录可以存储在各个概念数据实体中
（B）All of these全部选项
（C）To summarise the key data subject areas for a business area at a high level of abstraction to enable the major data concepts to be understood概括业务域下关键的高层抽像数据主题域，使大家能理解主要数据概念
（D）To agree the cardinality and optionality of relationships between all entities约定所有实体之间的基数与可选关系
（E）to determine the primary, alternate and foreign keys of entities决定实体的主键、备用键以及外键 答案解析: 这题考的是概念模型的理解，概念模型的介绍请见教材P225，1.3.5.1，我把内容提取如下: 概念看书可能很难理解，我找了一些例子，可以见下面gartner的图，其实就是我们说的各种蓝图差不多，业务蓝图，技术蓝图等的，属顶层设计，把各个关键的实体(业务)关系说清楚
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