a. Webmail is Web browser based and includes support for POP3 and IMAP4. Describe the differences between POP3-based Webmail and IMAP4-based Webmail.

b. Spam is flooding the Internet with many copies of the same e-mail message, in an attempt to force the message on people who would not otherwise choose to receive it. Propose some strategies for fighting spam.

c. What is the relationship among URI, URL, and URN? Write two examples for each scheme and explain their meaning

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