[单选题]ZXUN CSCF网元前台单板内部通信,全部使用( )平面,不同网元的前后台通信,需要划分不同VLAN。
Internal communication between foreground boards of the ZXUN CSCF all uses the ( ). For foreground/background communication of different NEs, we need to divide different VLANs. A.FABRIC面
Fabric plane B.BASE面
Base plane C.计费面
Billing plane D.信令面
Signaling plane