You have estimated two equations: Equation C. Length of Stay = 1.3 + 0.1*Medicare - O.1*Ceramic + 0.03*Age Equation D. Length of Stay = 2.8 + O.7*Medicare - O.2*Ceramic where Length of Stay is the number of days the patient spent in the hospital, Medicare and Ceramic are 1 if the patient's primary payer was Medicare or if the patient received a ceramic implant, respectively, and 0 otherwise. and Age is the patient's age in years. The root mean squared error (RMSE) based on a test set is 0.63 for Equation C and 0.45 for Equation D. Equation C is _ [more less] flexible than Equation D and offers _ [better, worse] predictive performance than Equation D. [This is a multipleanswer question. Check one answer in each of the two groups] C] more less [3 better worse