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Have a read of this: http://download.oracle.com/docs/cd/E12825_01/epm.111/epm_security/apas07.html
p.s. I had to edit my response (delete the answers) since I realized you are probably studying for the planning certification test and posting questions here and expect others to answer the questions for you, so you can pass? Sorry you are in the wrong place buddy!
Edited by: Mehmet Sevinc on Sep 29, 2011 9:57 AM