Option C is correct .
The backbone of internet is formed by internet exchange points (IXPs) are IP networking which allowing , allowing participant internet service provider to exchange data destined for their respective networks.
Internet exchange point is physical location through which internet infrastructure competencies such as internet service providers and CDNs are connect with each other.The primary alternative of IXPs is private peering , ISPs directly connect their networks to each others.
Its allow network to interconnect directly , the exchange , rather than going through one or more third party networks.Advantages of direct interconnection are cost, latency and bandwidths consists of more the one networks switches by which each of the participating ISPs connect.
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