Suppose your computer is connected to a WiFi network, which gives you the IP address of the local DNS server; however, the DNS Server was just rebooted and its cache is completely empty. Suppose that the RTT between your computer and the local DNS server is 5ms, and the RTT between the local DNS server and any other DNS server is 60ms. Assume the iterated query is used and all responses have TTL of 5 hours. (a) If you try to visit cs.ucla.edu, what would be the minimum amount of time that you need to wait before the web browser is able to initiate connection to the web server of UCLA CS? (Assume the ucla.edu name server is the authoritative DNS server for cs.ucla.edu) (b) Using the similar assumption as in part(a), if you try to visit bruinlearn.ucla.edu one minute later, what would be the minimum waiting time? (c) If you try to visit gradescope.com one minute later, what would be the minimum waiting time? (Assume the gradescope.com name server is the authoritative DNS server for gradescope.com) (d) Using the similar assumption as in part(c), if you try to visit google.com one minute later, what would be the minimum waiting time?