DNS (15 points) - Consider there is a local DNS server called Local-DNS, which is used by 3 local web clients for DNS resolution. Considering the 3 locale web clients will visit the same website (c se4589-ub.com) one by one with a time interval of 60 seconds. And there is no DNS cache for the specific domain name. The DNS records of the website are all of a TTL of 60 seconds. Also, the local DNS server is configured to do only iterative DNS queries. a) Which types of DNS resource records are needed by the web clients to visit the website? (5 points) b) At least how many queries have been made by Local-DNS to the authoritative DNS server of cse4589-ub.com, and why? (10 points)

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