Javier works for an online retail company. He wants to predict the amount spent online based on time spent online. However, he believes that there is a difference based on age group (young adult, middle age, and senior). After visual inspection of a scatterplot, he notices that there is a a set amount that is different between the age groups but not a difference in the expected change in the amount spent based on the time online by each group. What type of model should be fit? Regression Model with Interaction Variables O Regression Model with Indicator Variables O Quadratic Model