SORT_AREA SIZE and HASH_AREA_SIZE parameters are ignored in some of the user sessions. What could be the reason？（）

• A、The User Global Area （UGA） is not configured.
• B、The sessions were started using the login name SYS.
• C、The sessions are running in the Automatic Shared Memory Management mode.
• D、The sessions are running in the automatic Program Global Area （PGA） memory management mode.