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 trunk alternate destination routing (ADR) must be disabled for REFER
B . An application-controlled alternative is to set an ECC variable (user.sip.refertransfer) to the value y in the Unified ICM script
C . Router require on a failed SIP Refer transfer where the survivability service is not handling the SIP Refer request
D . Direct Refer transfer using label works only if Send To VRU node is NOT used before the Refer
E . Unified ICM sends Unified CVP a routing label with a format of rfXXXX
F . Standalone Cisco Unified CVP with ICM Lookup label

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Answer: BCE