Final answer:
The answer to the question is A) programming style, which is not a dimension used to categorize an open source community. Dimensions commonly used include the environment, the user community, and licensing.
Step-by-step explanation:
The question 'Which of the following is not a dimension used to categorize an open source community?' relates to understanding the different dimensions that are used to categorize open source communities. The dimensions usually include factors like the environment the software operates in, the user community which contributes to and uses the open source software, and the kind of licensing that governs the use and distribution of the software. Programming style, while important in many contexts, is not typically used as a foundational dimension for categorizing open source communities. Therefore, the correct answer is A) programming style.