What is the unlevered beta (Industry beta range) for Refining and Marketing using all the comparable companies and calculating a weighted average of unlevered beta; weights being the proportion of their market values? Corporate tax rate to be considered as 2006 tax rate (Exhibit 1) for Midland Energy Resources upto 2 decimal places XX.XX% Select one: O a. 0.90-0.91 O b. None of the options are correct O C. 1.00-1.25 O d. 0.50-0.70 O e. 0.80-0.89