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Consider the following multiple access protocols that we've studied: ( 1 ) TDMA, and FDMA ( 2 ) CSMA - CD and CSMA - CA

Consider the following multiple access protocols that we've studied:
(1) TDMA, and FDMA
(2) CSMA- CD and CSMA -CA
(3) Aloha
(4) polling
Which of these protocols are collision-free (e.g., collisions will never happen)?

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