The correct answer is D. Simple Mail Transfer Protocol.
SMTP is a standard protocol for sending email messages between servers. It is a text-based protocol, which means that messages are sent as a series of lines of text. SMTP is a connection-oriented protocol, which means that a connection is established between the sender and receiver before the message is sent.
SMTP is a very simple protocol. The basic steps involved in sending an email message using SMTP are as
follows:- The sender connects to the SMTP server of the recipient’s email provider.
- The sender identifies itself to the server.
- The sender specifies the recipient’s email address.
- The sender sends the message to the server.
- The server accepts the message and stores it for delivery to the recipient.
SMTP is a very important protocol for email. It is the protocol that is used to deliver email messages from one server to another. Without SMTP, it would not
be possible to send email messages over the internet.The other options are incorrect because they are not the full form of SMTP.