What is the by default optimizer in 9i and 10g?

Hi
All,
What is the by default optimizer in 9i and 10g?
Thanks,
Vishal

That must be a drag, having access to the Internet but not being able to search documentation.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#PFGRF10102

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