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TDMA and CDMA are methods of A. transmitting binary, digital, compressed data. B. allowing cell phone calls to switch between cells. C. sending cell phone locations to local towers. D. converting sound information into electricity.

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therezayadao
The correct answer is:A. transmitting binary, digital, compressed data.
TDMA and CDMA are methods or digital techniques that supply communications services to multiple users in a single-bandwidth wired or wireless medium. 
These allow multiple users to share these limited channels to give the economy of scale necessary for a successful communications business. 
aencabo
TDMA and CDMA are methods of A. transmitting binary, digital, compressed data. These are terms in  order to be read especially in computer world where binary are really useful. CDMA means Code-Division Multiple Access while TDMA means Time-division multiple access.