Key items in the bank's balance sheet and the applicable risk category of each asset are summarised below (all numbers are in millions of dollars). I he bank also has the tollowing ort-balance-sheet assets: - \$70 million in performance bonds issued to public corporations - $200 million in 10-year FX forward contracts with a replacement cost of negative $12 million. - $120 million in FX futures contracts traded through the Australian Securities Exchange. The conversion factor for performance bonds is 50% and for the forward contracts is 7.5%. The risk weight of a public corporations is 100%. Based on Basel III, what is the Tier 1 capital ratio of this bank? a. None of the options. b. 19.777% c. 5.991% d. 7.242% e. 4.457%