问题：

[单选] How are CTI ports in a CTI Port Group added on the CRS Server?（）

A . They must be created in Cisco Unified CallManager in ascending order (i.e., 1001, 1002, and 1003) with no gaps or missing numbers in the group.  
B . They can be assigned as a range of ports in CRS Application Administration.  
C . They are the same as the CTI Route Points in the Cisco Unified CallManager and automatically built in CRS when they are associated with the JTAPI user.  
D . They are the same as the CTI Route Points in the Cisco Unified CallManager and automatically built in CRS when they are associated with the RM JTAPI user.