Which of the following is possible to be referenced in external JavaScript?

Which of the following is possible to be referenced in external JavaScript? Correct Answer PHP

PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. One of the lesser known sides of external JavaScript is the ability to reference a PHP file instead of the familiar .js file.
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