Consider different activities related to email.
m1: Send an email from a mail client to a mail server
m2: Download an email from mailbox server to a mail client
m3: Checking email in a web browser
Which is the application level protocol used in each activity?
1. m1 : HTTP m2 : SMTP m3 : POP
2. m1 : SMTP m2 : FTP m3 : HTTP
3. m1 : SMTP m2 : POP m3 : HTTP
4. m1 : POP m2 : SMTP m3 : IMAP