What research method would you use for the study that has the research objectives$/$ questions below?

Brand: Kellogg$$s

Research Objective: Determining how well the product fares against the competition on grocery store shelves and how enticing their packaging$/$ product versus competitors

Specific Research Questions:

From the moment a consumer enters the aisle, how long does it take them to make a purchase decision?

Does product popularity seem to vary by age? By gender?

What body language or facial expressions are observed when people search for a product?

Survey

Observation

Focus groups

Mystery shopper