Ah, the good old TCP/IP model. I'm pretty sure that's a set of protocols used on both TCP and IP-based networks, not just one or the other. I'd go with C and D, just to be safe.
Hmm, this looks like a tricky one. I think C and D are the correct answers, as the TCP/IP model specifies how to transmit and route data packets, and it's used on IP-based networks.
Fausto
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