Question:What is ATM (Asynchronous Transfer Mode)? 

A It is a WAN technology based on frequency division multiplexing that uses fixed size packets known as cells 

B It is a WAN technology based on time division multiplexing that uses variable size packets. 

C It is a WAN technology based on time division multiplexing that used fixed size packets known as cells 

D It s a virtual circuit based WAN technology 

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