Final answer:
Asking for the number of siblings at a school is an example of collecting quantitative discrete data, not qualitative, it doesn't inherently violate privacy laws if done correctly, and it is not an open-ended question.
Step-by-step explanation:
Asking for the number of siblings at a school isn't statistically wrong; rather, it provides data that can be factually interpreted. Option (a) 'It violates privacy laws' is incorrect because the question doesn't inherently violate privacy laws, especially if participation is voluntary and data collection complies with privacy regulations. Option (b) 'It is a qualitative variable' is incorrect because the number of siblings is a count and thus represents quantitative discrete data, not qualitative. Option (c) 'It is a discrete variable' is true because the number of siblings can only take on integer values (0, 1, 2, ...), and there are no in-between values—this is the nature of discrete variables. Lastly, option (d) 'It is an open-ended question without specific boundaries' is incorrect because the question has a clear boundary and doesn't require subjective responses or elaborate descriptions as open-ended questions do. The question is straightforward and can be answered with a specific number, making it a closed-ended question suited for collecting quantitative data.