In the Oracle9i Data Guard architecture， what is the purpose of the Log Transport Services？（）

A.You must use Oracle predefined names to identify raw partitions that will hold OMF structures. 
B.You must define directories for two online redo log groups and three copies of the control file. 
C.If your CREATE DATABASE command fails, any OMF database files that have already been created will be dropped automatically. 
D.You must use only OMF data files when adding new tablespaces or data files to your database in the future.

A.SYNC or ASYNC to identify the network transmission mode. 
B.LGWR or ARCH to identify the primary database process responsible for sending redo information to the standby. 
C.AFFIRM or NOAFFIRM to control whether log archiving disk write operations are to be performed synchronously or asynchronously. 
D.PROTECTED or UNPROTECTED to control the degree of divergence and data loss at the standby database.

A.You cannot create global range partitioned indexes on the table. 
B.The optimizer will not execute partition wise joins on the table’s partitions. 
C.You must include at least one element in the value list of each partition of the table, even if that element is the keyword NULL. 
D.Partition pruning will not occur during query optimizer if a range of values is included in the query predicate.