Frank Buss enhanced SSL/TLS option handling in the curl/curl repository by introducing SSLSUPP flags to improve backend detection of unsupported curl_easy_setopt options. Working in C, he focused on robust error handling and SSL/TLS configuration, ensuring that explicit error paths are returned when unsupported options are used, which eliminates silent failures and reduces runtime surprises. His changes updated SSL option checks and backend support structures, aligning them with the new flags and error reporting mechanisms. This work addressed issue #20364, improved reliability for users and developers, and laid the foundation for future enhancements in SSL option management within the codebase.