The correct answer is B. Cdma2000.
Cdma2000 is a 2.5G CDMA standard that was developed by the Third Generation Partnership Project (3GPP). It is an evolution of the IS-95 CDMA standard, and it offers a number of improvements, including higher data rates, better voice quality, and support for multimedia services.
Cdma2000 is a wideband CDMA system, which means that it uses a wider bandwidth than narrowband CDMA systems like IS-95. This allows Cdma2000 to support higher data rates. Cdma2000 also uses a different modulation scheme than IS-95, which results in better voice quality. Additionally, Cdma2000 supports multimedia services, such as video calling and streaming music.
Cdma2000 is a widely deployed standard, and it is used by a number of different mobile operators around the world. It is a good choice for mobile users who need high data rates, good voice quality, and support for multimedia services.
IS-95 is a 2G CDMA standard that was developed by the Telecommunications Industry Association (TIA). It was the first CDMA standard to be deployed commercially, and it was widely used in the United States and other countries. IS-95 is a narrowband CDMA system, which means that it uses a narrower bandwidth than wideband CDMA systems like Cdma2000. This limits the data rates that can be supported by IS-95. Additionally, IS-95 uses a different modulation scheme than Cdma2000, which results in lower voice quality.
CdmaOne is an older version of the IS-95 CDMA standard. It is a narrowband CDMA system that offers lower data rates and voice quality than Cdma2000. CdmaOne is no longer widely used, but it is still used by some mobile operators in developing countries.