You have included the following parameter setting in your server parameter file：       PGA_AGGREGATE_TARGET = 800M        SORT_AREA_SIZE = 100M        HASH_AREA_SIZE = 100M        BITMAP_MERGE_AREA_SIZE = 100M        CREATE_BITMAP_AREA_SIZE = 100M   Which statement is true？（）  

• A、 All the *_AREA_SIZE parameters are ignored.
• B、 The Automatic PGA Memory Management feature cannot be disabled.
• C、 The total Program Global Area （PGA） memory cannot be manually increased above 800M.
• D、 The total memory for the PGA can automatically exceed 800M using the Automatic PGA Memory Management feature.