Final answer:
The best example of a mixed methods design is bringing together multiple sources of data.
Step-by-step explanation:
The best example of a mixed methods design among the given options is d. bringing together multiple sources of data. A mixed methods design involves combining both qualitative and quantitative methods to gather and analyze data. In this case, bringing together multiple sources of data means using a combination of qualitative and quantitative data to gain a comprehensive understanding of the research topic.