Which four statements are correct about communication between parallel execution process?

Which four statements are correct about communication between parallel execution process?

A.
The number of logical pathways between parallel execution producers and consumers depends
on the degree parallelism.

B.
The shared pool can be used for parallel execution messages buffers.

C.
The large pool can be used for parallel execution messages buffers.

D.
The buffer cache can be used for parallel execution message buffers.

E.
Communication between parallel execution processes is never required if a query uses full
partition-wise joins.

F.
Each parallel execution process has an additional connection to the parallel execution
coordinator.

Explanation:
A: Note that the degree of parallelism applies directly only to intra-operation
parallelism. If inter-operation parallelism is possible, the total number of parallel execution servers
for a statement can be twice the specified degree of parallelism. No more than two sets of parallel
execution servers can run simultaneously. Each set of parallel execution servers may process
multiple operations. Only two sets of parallel execution servers need to be active to guarantee
optimal inter-operation parallelism.
B: By default, Oracle allocates parallel execution buffers from the shared pool.
F: When executing a parallel operation, the parallel execution coordinator obtains parallel
execution servers from the pool and assigns them to the operation. If necessary, Oracle can
create additional parallel execution servers for the operation. These parallel execution servers
remain with the operation throughout job execution, then become available for other operations.
After the statement has been processed completely, the parallel execution servers return to the
pool.
Reference: Oracle Database Data Warehousing Guide, Using Parallel Execution