问题描述：
[多选]
The InnoDB engine has a feature known as clustered indexes．InnoDB引擎有一个称为聚集索引的特性。Which three statements are true about clustered indexes as used in InnoDB？对于InnoDB中使用的聚集索引，哪三种说法是正确的？
A．A primary key must exist for creation of a clustered index.
B．A primary key is used as a clustered index. 主键用作聚集索引。
C．A clustered index is a grouping of indexes from different tables into a global index for faster searching.
D．If no indexes exist, a hidden clustered index is generated based on row IDs. 如果不存在索引，则根据行id生成隐藏的聚集索引。
E．A clustered index provides direct access to a page containing row data. 聚集索引提供对包含行数据的页的直接访问。
F．The first unique index is always used as a clustered index and not a primary key.
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