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The number of following network standards do not use CSMA / CD protocol ___________ .
I. Ethernet                       II. Wifi
III. Bluetooth                   IV. Wife max

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wireless system is not used by CSMA/CD so here Ethernet is wired system and other like wifi , wifemax, blueooth are wireless so they can't support CSMA/CD. hence option (ii), (iii) , (iv) is correct.
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