Which of the following Cisco Unified Customer Voice Portal call-flow models does not require a Cisco IOS-based VoiceXML Gateway?

A.
Standalone Self-Service

B.
Cisco Unified Customer Voice Portal Call Control

C.
Cisco Unified Customer Voice Portal Call Control with Queue and Collect

D.
Cisco Unified Customer Voice Portal Call Control with Queue and Self-Service

E.
Cisco Unified Contact Center Enterprise Network Interface Controller-based Call Control with Cisco Unified Customer Voice Portal Queue, Collect, and Self-Service