设有关系模式R（A1，A2，A3，A4，A5，A6），其中：函数依赖集F={A1→A2，A1A3→A4，A5A6→A1，A2A5→A6，A3A5→A6},则（ ）是关系模式R的一个主键，R规范化程度最高达到（ ）。
问题1选项
A.A1A4
B.A2A4
C.A3A5
D.A4A5
问题2选项
A.1NF
B.2NF
C.3NF
D.BCNF
正确答案及解析
正确答案
解析
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