You want to test the effect of a new brand logo on in-store customers' attention toward its products. What research design would you use and why? A secondary research design because it helps to evaluate consumers' attention toward marketing stimuli A qualitative research design because it helps to measure consumers' purchase intention when exposed to marketing stimuli A quantitative research design because it helps to explore the beliefs behind attention to a marketing stimulus and its effects on consumers' behaviors An experimental research design because it helps to test the causal relationship between marketing stimuli and consumers' behaviors