Oracle Net Services is composed of several communication layers， known as a stack，which enables clients and database severs to share，modify，and manipulate data. Which reveals the correct architecture，in hierarchical order，of the client-side stack？（）

A.Each target database requires its own recover catalog. 
B.RMAN scripts can be stored in the recovery catalog or the target control file. 
C.A channel is a stream of data to a device type and corresponds to one server session. 
D.The RMAN executable interprets sever session commands and establishes connections to the target database.

A.A text copy of the control file.
B.A binary copy of the control file.
C.A file containing a SQL statement which will re-create the database.
D.A file containing a SQL statement which will re-create the control file.