C. Allow a DNS client to contact several DNS servers until the correct information is found.
In an iterative DNS query, the DNS client queries a DNS server, and if that server does not have the requested information, it returns the best answer it can provide (often a referral to another DNS server). The client will then follow those referrals, contacting each server iteratively until it either finds the requested information or exhausts its search.
C. Allow a DNS client to contact several DNS servers until the correct information is found.
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