CNA的AREA有哪些?

如题。
CNA的AREA有哪些?
A、alid Area
B、Planned Area
C、Fallback Area
D、Log Area

Valid area : a model of real network . Retrive dataadjustmentauto update fads
Planned area: a user created deletemodify etc objects update to the real network
Fallback area:a complete copy of the valid area when fallback area created.for the fallback area may be created planned area for restore.
Log area :a log area is created via PMR APPL.The log area is used to store the Mos parameters when PMR session starts.
 
这是爱立信CNA软件中的功能区域
因此选择  B、C、D