The management team of Zara Australia would like to conduct a survey study with consumers who visit the 19 Zara stores in Australia. They would like to collect a sample of 500 consumers for the study. The key objective of the study is to understand how consumers like their sustainability initiatives such as using organic, sustainable, or recycled cotton, linen, and polyester in making their clothing products. These 19 stores are all located in major cities such as Melbourne (5 stores), Sydney (7 stores), Adelaide (1 store), Perth (1 store), Canberra (1 store), and Brisbane (4 stores). Based on some preliminary data, the management team believes that consumers in each city may have different responses to their key research question but within each city, consumers should have similar responses. Which sampling method(s) would you recommend the management team to use?

Justify your choice and describe the process of the sampling method(s) you recommended to the management team in Zara. Note that you do NOT need to calculate specific numbers in this explanation (e.g., how many sample units to select from which city). Instead, you just need to clearly explain the process/steps you will take to make the selections.