Imagine that you need to research your customers' (or customers in general if not serving customers currently) level of satisfaction with your product (or service) you are currently offering (as an organization or as an employee). Briefly describe why you would choose the option(s) with respect to the followings: (1) sampling (probability or non-probability sampling? Why?), (2) data collection (survey, observation, or experiment? Why?), (3) research instrument (qualitative or quantitative), (3) contact method (mail, telephone, personal, online)