View Exhibit1 and Exhibit2 to examine the current memory allocation and parameter settings，respectively. Why are advisors not available for the shared pool and the buffer cache（　）

• A、because the DB_CACHE_ADVICE parameter is set to OFF
• B、because Automatic Memory Management （AMM） is disabled for the database instance
• C、because Automatic Shared Memory Management （ASMM） is enabled for the database instance
• D、because the values for the DB_CACHE_SIZE and SHARED_POOL_SIZE parameters were not setinitially