Which Cisco collaboration product line will reduce TCO. Improve the user experience and productivity, and increase business relevance?（）

A.ip communications
B.conferencing
C.customer care
D.telepresence
E.messaging

A.Call management software
B.Media Convergence Servers (MCSs)
C.Voice gateways
D.IP telephones

A.technical staffing
B.data center deployments
C.employee training
D.cost containment
E.operational efficiency
F.customer responsiveness