Why are call types important in the Cisco Unified Contact Center Enterprise system?

Why are call types important in the Cisco Unified Contact Center Enterprise system?

A.
They replace skill group data for a call.

B.
They allow the system to track a call across multiple peripherals.

C.
They allow CTI screen-pop data to be sent to agents with the call.

D.
They are required to translation-route the call to the Cisco Unified IP IVR or Cisco Unified Customer Voice Portal.