In your running instance， some of the initialization parameters are set as shown below： SGA_MAX_SIZE = 14GB  DB_CACHE_SIZE = 1GB  SHARED_POOL_SIZE = 3GB  STATISTICS_LEVEL = BASIC  PGA_AGGREGATE_TARGET = 0  You plan to enable Automatic Shared Memory Management but you are not able to set SGA_TARGET to a nonzero value. What could be the reason？（）

• A、The STATISTICS_LEVEL initialization parameter is set to BASIC
• B、The PGA_AGGREGATE_TARGET initialization parameter is set to zero.
• C、The SGA_MAX_SIZE initialization parameter is set to less than 20 GB
• D、The DB_CACHE_SIZE initialization parameter is set to less than 5 GB
• E、The SHARED_POOL_SIZE initialization parameter is set to a nonzero value.