In the Oracle9i Data Guard architecture, what is the purpose of the Log Transport Services?
A. to transfer redo log information to one or more destinations
B. to apply redo log records sent from the primary database to a standby database at the receiving location
C. to synchronize changes to the control files on all standby databases with changes on the primary database when a log switch occurs
D. to batch archived log files on the primary database until a defined number of checkpoints have been processed and then to distribute the archives to each standby database