Which of the following is not a programming language?

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Recognizing what counts as a programming language means identifying a formal system with syntax and semantics that we use to write instructions for a computer, supported by tools like compilers or interpreters. Python, Java, and C# all fit this role, each with its own well-defined rules and ecosystems for building software. Rhododendron, however, is a genus of flowering plants and has no programming syntax or execution model, so it cannot be used to write or run code.