Which of the following would be used to send messages using the SMTP protocol?
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A. B. C. D.D.
The correct answer is D. Email software.
SMTP (Simple Mail Transfer Protocol) is a protocol used to send email messages between servers on the internet. Email software is specifically designed to use SMTP to send email messages from one email address to another.
Document sharing software (option A) is designed to share files, but not specifically email messages using SMTP. Instant messaging software (option B) is designed for real-time communication and is not specifically designed to use SMTP to send email messages. Conferencing software (option C) is designed for audio or video conferencing and is not specifically designed to use SMTP to send email messages.
Therefore, the most appropriate software to use to send messages using the SMTP protocol is email software, which is specifically designed for this purpose.