What is the maximum number of CTI ports for an IPCC Expess Standard deployment? （）

A.CRS 2.2 to CRS 3.5 
B.CRS 3.1 to CRS 4.0 
C.CRS 2.2 to CRS 4.0 
D.CRS 3.5 to CRS 4.0 
E.CRS 4.0 to CRS 3.0 
F.CRS 2.1 to CRS 4.0

A.IPCC Express (Standard, Enhanced, or Premium) 
B.IP IVR 
C.Auto Attendant 
D.IPCC Express Cisco Agent Desktop 
E.IP Queue Manager
F.IP IVR Peripheral Gateway (PG)

A.25 
B.50 
C.no enforced limit 
D.as many as the number of ports supported on the server