Which two of the following are valid CRS deployment scenarios?（）

• A、IPCC Express communicating with the ICM via a standalone IPCC Gateway PG running on an expansion server  
• B、IPCC Express communicating with the ICM via a co-resident IPCC Gateway PG
• C、IPCC Express using the IPCC Enterprise Outbound option  
• D、IPCC Express using the IPCC Enterprise CTI-OS Toolkit  
• E、IP IVR integrating with IPCC Enterprise to function as queue point and self-service platform