You work as a database administrator for Supportcenter.cn. In a production environment， users complain about the slow response time when accessing the database. You have not optimized the memory usage of the Oracle instance and you suspect the problem to be with the memory. To which type of object would you refer to determine the cause of the slow response？（）
- AThe trace file
- BThe fixed views
- CThe data dictionary views
- DThe operating system log fields
- EThe dynamic performance views.