Which of the following is currently used in conjunction with most Internet-based certificates to provide continuous authentication?

S/MIME is used for securing email messages, not general internet-based continuous authentication for services.

Secure Sockets Layer (SSL), now largely superseded by Transport Layer Security (TLS), uses X.509 certificates to authenticate servers (and optionally clients) and establish an encrypted connection, providing continuous authentication and data integrity for internet-based communications like web browsing.

SSH is primarily used for secure remote access to computers, not for securing general internet-based services with certificates for continuous authentication.

SET was a protocol for securing credit card transactions over unsecured networks but is largely defunct and not widely used today for general internet authentication.