Globally, most cell phone carriers use GSM technology, a combination of time division and frequency multiplexing. Why do you think this has become the multiplexing technology of choice for most carriers?
Why not code division, for example, which some major US cell phone carriers still use?

Quick pl which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

Need ! will choose brainliest! discuss the role of abstraction in the history of computer software.