Ans is B
Call control is a process that is used in telecommunications networks to monitor and maintain connections once they have been established. so Call control protocol related to connection mgt
The BIS in ABIS stands for BSC To BTS Interoperability Specification.The interface between BSC & BTS is called as 'Abis interface'.
The Base Station Management Application Part (BSMAP) supports all Radio Resource Management and Facility Management procedures between the MSC and the BSS, or to a cell(s) within the BSS
Code-Division Multiple Access, CDMA is a digital cellular technology that uses spread-spectrum techniques