Which of the following is not a common programming language?

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A programming language is a formal system with syntax and semantics used to write instructions that a computer can execute, supported by compilers or interpreters and a community of developers. Python, Java, and C++ fit that description and are widely used with extensive tooling and libraries. Rhododendron, however, is a genus of flowering plants and has no role in computing. It isn’t a programming language, so it’s the option that isn’t a common programming language.