Select the correct statement(s) regarding Internet Exchange Points (IXPs) and/or Network Access Points (NAPs).
a. IXPs and NAPs are facilities that enable interoperability between autonomous systems at OSI layers 1, 2, and 3
b. peering agreements between Internet Service Providers (ISPs) within an IXP or NAP ensures the proper counting of exchanged packets and the application of appropriate surcharges
c. IXPs and NAPs are facilities that enable the direct connection of privately owned intranets to the Internet
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