The correct answer is A. IMT 2000.
IMT 2000 is the term used by the International Telecommunication Union (ITU) for a set of global standards of 3G systems. It is a third-generation mobile telecommunications technology that offers a wide range of services, including high-speed data transfer, video calling, and mobile internet access.
GSM is a second-generation mobile telecommunications technology that is still widely used in many parts of the world. It is a digital technology that offers voice and data services.
CDMA is a second-generation mobile telecommunications technology that is used in some parts of the world. It is a digital technology that offers voice and data services.
EDGE is a technology that is used to improve the performance of GSM networks. It offers higher data rates than standard GSM.
IMT 2000 is a more advanced technology than GSM, CDMA, and EDGE. It offers a wider range of services and higher data rates.