Which three options are valid when Cisco Unified Customer Voice Portal comprehensive call flow and survivability service handles SIP REFER? (Choose three.)
A . SIP REFER label and SigDigits
B . SIP REFER with ICM router requery
C . SIP REFER with ICM script Send To VRU node
D . SIP REFER with custom SIP header
E . SIP REFER with routing label "rfxxxx" and standalone Cisco Unified CVP with ICM Lookup label
F . SIP REFER with ECC variable user.sip.transfer
Answer: ACD