Problem 1 Circle the correct answer, no justification needed. a) Persistent HTTP shows the greatest performance advantage over nonpersistent HTTP when downloading a page with a large object. True or False b) A web cache, or proxy server, is a network entity that satisfies HTTP requests from clients. True or False c) In the TCP congestion control, multiplicative decrease in congestion window improves fairness. True or False d) Which of the following is NOT a mail access protocol (used at a client to fetch emails from a mail server)? A) POP3 B) IMAP C) SMTP D) A, B and C are all mail access protocols e) Which DNS record type provides a mapping between the canonical name of a mail server and its alias name? A) Type A B) Type CNAME C) Type MX D) Type NS