Answer: exploratory research
Explanation: In simple words, exploratory research refers to the research which is conducted for problem that involves knowing what is going on in the current situation. These researches results in development of conclusion that is completely new.
In the given case, Nancy bales has to make a research about a product that is new to the market. She has to conclude if that item is better than the i-pod or not.
Hence we can conclude that Nancy has to perform exploratory research.