How can the Cisco collaboration services layer of Cisco Collaboration Architecture help managers to measure KPIs?

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How can the Cisco collaboration services layer of Cisco Collaboration Architecture help managers to measure KPIs?

A. The Cisco collaboration services layer is a standalone element of Cisco Collaboration Architecture and delivers services that directly improve business KPIs
B. Cisco collaboration services and infrastructure layers compose Cisco Collaboration Architecture that improves technical KPIs.
C. The Cisco collaboration services layer delivers additional performance information to demonstrate increased business performance.
D. Conferencing, IP communications, telepresence, and other Cisco collaboration services deliver additional information to show the increased business