Next year Biontech expects to generate FCFs of $500,000, which are expected to grow at a rate of 4% per year thereafter. Biontech has an equity cost of capital of 10%, a debt cost of capital of 5%, and it is in the 40% corporate tax bracket. If Biontech currently maintains a 0.8 debt to equity ratio, then the value of Biontech's interest tax shield is closest to: Select one: O a. $19 million O b. $5 million O c. $20 million O d. $4 million