4. For question 4, you will use the prostate data in the faraway package. Consider the following three models. ( Model A) Response: 1psa Predictors: Icavol, Iweight , svi ( Model B) Response: 1psa Predictors: Icavol, Iweight, svi, Ibph (Model C) Response: 1psa Predictors: Icavol, lweight, svi, Ibph, lep, gleason Do not use polynomial or interaction terms. (a) Find the best model in terms of AIC, BIC and adjusted R, respectively. (b) Find the best model using R2 as the quality criterion. Explain why R is not an appropriate measure for model comparison