Which memory area is used as the communication area for I/O buffers?

To simulate asynchronous I/O for your database, you set the value for the DBWR_IO_SLAVES parameter. The large pool and Java pool are configured for the database instance.
Which memory area is used as the communication area for I/O buffers?

A.
The java pool

B.
The large pool

C.
The shared pool

D.
Memory space allocated separately outside the SGA