Which of the following is an example of ethnographic research?A) The marketing team at Amex Inc. conducts surveys through mail.B) The marketing team at ProValue Corp. analyzes information from its internal database.C) A researcher at Evans Inc. manipulates the variable of price and studies sales records. D) A researcher at Louis Inc. visits customers' homes to observe their daily routines. E) The research team at Hollis Inc. uses secondary data to draw inferences about the firm's customer service.

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