how to know audit file SYS$options and PRIV$USED menaing???

We have been setup "audit" function to audit some system grant privileges.
Audit files are write to "OS" not DB.  I check audit file but don't understand 
what is "code" on SYS$OPTION and PRIV$USED.  Anyone can help me on that?

=========   audit file content   ======

ACTION: "105" 
RETURNCODE: "0" SYS$OPTIONS: "4" OS$USERID: "oracle" PRIV$USED: 4




      
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