a) Why is the terminology of client and server is still being used in peer-to-peer (p2p) applications? Rectangular Snip b) Describe how web caching can reduce delay in receiving a requested object. Will Web caching reduce the delay for all objects requested by a user or for only some of the objects? Explain why c) Explain clearly the issues related to non-persistent HTTP application protocol and explain how persistent HTTP application protocol overcomes the issues effectively. d) Suppose Ironman with a web-based email account (such as Hotmail or Gmail), sends a message to Spiderman, who access his mail from his e-mail server using IMAP. Discuss how the message gets from Ironman's host to Spiderman's host with the help of a diagram. Be sure to list the series of application layer protocols that are used to move the message between the two hosts.