Final answer:
Nielsen would act as a consultant for the company, providing valuable market research and analysis to help the company understand its customer base and make data-driven decisions.
Step-by-step explanation:
If a company hires Nielsen to get insights into their customer base, Nielsen would best be described as a consultant from the perspective of the company. Nielsen is well-known for providing market research and analysis, which companies use to gain a better understanding of their consumer demographics, preferences, and behaviors. As consultants, Nielsen offers expertise and advice that help companies make informed decisions to improve their products, marketing strategies, and overall business performance.