You have included the following parameter settings in your SPFILE://    SGA_MAX_SIZE=8G   SGA_TARGET=6G   DB_CACHE_SIZE=2G   SHARED_POOL_SIZE=1G   LOG_BUFFER=64M   DB_KEEP_CACHE_SIZE=960M   Which statement is true if you modify the SGA_TARGET initialization parameter？（）

• A、The SGA_TARGET initialization parameter cannot be set to a value greater than 8G
• B、 The DB_CACHE_SIZE initialization parameter cannot be set to a value less than 2G
• C、 The DB_CACHE_SIZE initialization parameter cannot be set to a value greater than 2G
• D、 The DB_KEEP_CACHE_SIZE initialization parameter cannot be set to a value greater than 960M 
• E、 The DB_KEEP_CACHE_SIZE initialization parameter cannot be set to a value less than 960M