Final answer:
ROM is not software; Windows Media Player, OS X, and Firefox are examples of software.
Explanation:
ROM is not an example of computer software as it stands for Read-Only Memory, which is a type of hardware memory.
Windows Media Player, OS X, and Firefox are all examples of computer software, as they are applications that run on a computer's operating system.
Therefore, the correct answer is ROM, which is hardware, not software.
Learn more about types of computer components here:
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