Which statement best indicates a cipher suite is obsolete in a modern environment?

• A. The cipher suite is part of TLS 1.3
• B. The cipher suite uses modern algorithms with forward secrecy
• C. The cipher suite is not listed in any client’s supported list
• D. It is no longer supported by major browsers and security standards

Answer: (D)

Obsolete cipher suites are mainly identified by lack of support from the platforms that matter today. When major browsers and security standards no longer support a suite, clients won’t negotiate it during TLS handshakes, and servers that offer it won’t be usable with modern clients. That combination makes it effectively unusable and noncompliant with current security guidelines.

So the statement that it is no longer supported by major browsers and security standards is the clearest indicator of obsolescence. The other points describe attributes of modern or non-deprecated configurations (being part of TLS 1.3, using modern algorithms with forward secrecy), or suggest limited adoption rather than explicit deprecation.