Which three options are valid when Cisco Unified Customer Voice Portal comprehensive call flow and survivability service handles SIP REFER? (Choose three.)

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

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Answer: ACD