Consider different activities related to email:

m$1$: Send an email from a mail client to a mail server

m$2$: Download an email from mailbox server to a mail client

m$3$: Checking email in a web browser

Which is the application$-$level protocol used in each activity? Elaborate

$($a$)$ M$1$: HTTP m$2$: SMTP m$3$: POP

$($b$)$ M$1$: SMTP m$2$: FTP m$3$: HTTP

$($c$)$ M$1$: SMTP m$2$: POP m$3$: HTTP

$($d$)$ M$1$: POP m$2$: SMTP m$3$: IMA