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- 单项选择题 Note the points about data dictionary views and dynamic performance views： 1.These are stored in the SYSTEM tablespace. 2.These are the based on the virtual tables. 3.These are owned by the SYSuser. 4.These can be queried by a normal user only if O7_DICTIONARY_ACCESSIBILTY parameter is set toTRUE. 5.V$FIXED_TABLE view can be queried to list the names of these views. Which statements listed describe the data dictionary views（）
A、1 and 3
B、2，3，and 5
C、1，2，and 3
D、2，3，4，and 5
- A
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