Which protocol and port combination is primarily used for securely transferring web pages from web servers to clients?
FTP | 21
Telnet | 23
SMTP | 25
HTTPS | 443
HTTPS on port 443 is the correct answer because it is the secure version of HTTP, using encryption (SSL/TLS) to securely transfer web pages from web servers to clients. FTP on port 21 is used for file transfers but not specifically for web pages. SMTP on port 25 is used for sending emails, not web pages. Telnet on port 23 offers text-oriented communication but lacks encryption, making it inappropriate for secure transfers.
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