A. FTP
B. SMTP
C. HTTP
D. TCP

Explanation:

SMTP stands for Simple Mail Transfer Protocol. It is the standard protocol used to send emails from one server to another.

Whenever you click the “Send” button in Gmail, Outlook, or Yahoo Mail, SMTP helps deliver that email to the recipient.

Key Points:

• SMTP sends outgoing emails
• Used by all major email services
• Essential for email communication