Which of the following statements is CORRECTY O a. Sunk costs were formerly hard to deal with, but once the NPV method came into wide use, it became possible to simply include sunk costs in the cash flows and then calculate the project's NPV. O b. Asunk cost is any cost that must be expended to complete a project and bring it into operation. O cAsunk cost is any cost that was expended in the past but can be recovered in the fim decides not to go forward with the project O d. A sunk cost is a cost that was incurred and expensed in the past and cannot be recovered if the firm decides not to go forward with the project. e. A good example of a sunk cost is a situation where Home Depot opens a new store, and that leads to a decline in sales of one of the firm's existing stores