Consider the activities A1, A2 and A3 related to email: A1: Send an email from a mail client to a mail server A2: Download an email from mailbox…

Consider the activities A1, A2 and A3 related to email:

A1: Send an email from a mail client to a mail server

A2: Download an email from mailbox server to a mail client

A3: Checking email in a web browser

Which are the application-level protocols used in each activity?

1. a) A1: HTTP A2: SMTP A3: POP
2. b) A1: SMTP A2: FTP A3: HTTP
3. c) A1: SMTP A2: POP A3: HTTP
4. d) A1: POP A2: SMTP A3: IMAP