Question: What if the ISP's web server cannot locate the IP information on the default DNS server? The default DNS server contacts one of the DNS

What if the ISP's web server cannot locate the IP information on the default DNS server?
The default DNS server contacts one of the DNS servers. A root DNS server knows the location of all the DNS servers that contain the master listings for an entire top-level domain.
The default DNS server contacts one of the root DNS servers. A root DNS server has a search utility that searches the IP information for an ISP's default DNS server.
The default DNS server contacts one of the root DNS servers. A root DNS server contains a database of all the IP addresses that are not present in the ISP's default DNS server.
The default DNS server can only contact the second-level domain.
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 What if the ISP's web server cannot locate the IP information

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