简述组播业务的基本配置步骤?
A.CTI系统配置->WAS基本配置->VDN配置->VDN监控台配置
B.WAS基本配置->CTI系统配置->VDN监控台配置->VDN配置
C.WAS基本配置->CTI系统配置->VDN配置->VDN监控台配置
D.CTI系统配置->WAS基本配置->VDN监控台配置->VDN配置
A8M
B16M
C32M
D64M