With a = 0.05, refer to the excerpt of the regression output from Project 1 below and select the correct statement regarding the decisions to remove insignificant variables. Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept -413.499 307.832 -1.343 0.181 -1021.953 194.955 Age 45.235 7.505 6.028 0.000 30.402 60.069 Experience 28.043 11.932 2.350 0.020 4.459 51.626 Advertising 75.388 58.116 1.297 0.197 39.482 190.259 IT help 72.122 55.262 1.305 0.194 -37.107 181.351 Unpaid -3.826 17.801 -0.215 0.830 -39.010 31.358 Select one: O a. Variable Unpaid should be removed, as its p-value is the highest among the insignificant independent variables. O b. Variable Age should be removed, as its p-value is 0.000 which is less than 0.05. O c. Variable Experience should be removed, as its p-value is the lowest among the insignificant independent variables (0.02). O d. Intercept should be removed, as it has the lowest negative coefficient of -413.5