(c) What is the input variable? What is the output variable?

To provide a clear answer, I need more context about the specific situation or model you are referring to. In general terms: - **Input Variable**: This is the variable that is fed into a model or system. It is the independent variable that you manipulate or control to observe its effect on the output. For example, in a machine learning model predicting house prices, the input variables could include features like square footage, number of bedrooms, and location. - **Output Variable**: This is the variable that is the result of the model or system's processing of the input variables. It is the dependent variable that you are trying to predict or explain. In the house price example, the output variable would be the price of the house. If you provide more details about the specific context or model you are asking about, I can give a more tailored response.