Two Main Types of Cell Phone Networks (GSM and CDMA)

Multiple Choice

Two main types of cell phone networks (GSM and CDMA) are used in the world. CDMA is used primarily by Verizon and Sprint in the United States. GSM is used by AT&T and T-Mobile in the United States as well as in most of the rest of the world. This information indicates that

A) there is an industry standard in the United States, but not in the rest of the world.
B) CDMA is the global industry standard for cell phone networks.
C) while there is an industry standard in many countries, there is not an industry standard in the United States.
D) GSM is the global industry standard.