Solve using R studio and provide the codes Suppose that you want to fit a second-order response surface model in a situation where there are k = 4 factors; however, one of the factors is categorical with two levels. What model should you consider for this experiment? Suggest an appropriate design for this situation. Don't provide already available answer, provide answer only with R studio as I will give thumbs down if it is not R studio Provide R studio codes

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