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→ TCP is used in transport layer to carry out mail which is initiated by application layer protocol SMTP.
Primary protocols for E-Mail management
Post Office Protocol (POP)
Simple Mail Transfer Protocol (SMTP)
Internet Message Access Protocol (IMAP)
The above protocols are Application Layer Protocols
→ Once a client connects to the E-Mail Server, there may be 0(zero) or more SMTP transactions. If the client has no mail to send, then there are no SMTP transactions. Every e-mail message sent is an SMTP transfer.
→ SMTP is only used to send (push) messages to the server. POP and IMAP are used to receive messages as well as manage the mailbox contents(which includes tasks such as deleting, moving messages etc.).
1 votes
1 votes

E-mail uses SMTP as application layer protocol.

TCP and UDP are two transport layer protocols. SMTP uses TCP as transport layer protocol as TCP is reliable.

HENCE OPTION D IS CORRECT

1 votes
1 votes
See in this question we might confuse with snmp with smtp.

SNMP : Is used for Network managements for collecting the information for all devices on ip network. SO it's not used for email.

SMTP:as it clearly  pronounced SIMPLE MAIL TRANSFER PROTOCOL is going to be used to provide the support for mailing.

It defines MTA (message transfer agent ) client and server in the internet.
Answer:

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