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Consider the following application layer services:

  1. Domain names to $\text{IP}$ Address mapping
  2. Data communication over the World Wide Web
  3. Electronic mail transmission
  4. Retrieve e-mail from a remote server
  5. Transfer files from one host to another host

Which one of the following order of application layer protocols is correct for the above services?

  1.  $\text{DNS, HTTP, POP, SMTP, FTP}$
  2.  $\text{DNS, HTTP, SMTP, POP, FTP}$
  3.  $\text{DNS, FTP, SMTP, POP, FTP}$
  4.  $\text{HTTP, FTP, POP, SMTP, DNS}$  
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