The following table shows a small segment of the dataset Retirement Funds. Retirement Funds Market Fund Risk Turnover Assets SD Type Level Ratio Large Value Low 10255.29 17.00 10.63 Large Growth Average 998.27 222.00 12.04 MidCap Value Average 107.49 111.00 12.97 Small Value Average 193.21 74.00 13.27 Small Growth High 514.49 100.00 16.15 Mid Cap Growth High 226.32 110.40 14.50 Small Growth High 200.01 116.00 15.39 Large Growth High 3556.66 34.00 15.24 What type of variable is "Risk Level"? Select one: a. Categorical b. Numerical c. None of the above