Sparkling Clean makes household products. The firm is considering the production of a new disinfecting cleaner. In evaluating whether to go ahead with the project, which item should be explicitly considered when cash flows are estimated?

a) The company spent $2 million on market research related to the disinfectant cleaner. These funds cannot be recovered, but the research is expected to benefit other projects that might be proposed in the future.

b) The production of the disinfectant cleaner would be in a vacant building owned by Sparkling Clean. The building will be sitting empty if it is not used for the production of the disinfectant cleaner. Due to its location in the middle of the firm's production facilities, the building cannot be leased or sold.

c) Sales of the existing (non-disinfecting) cleaner are not expected to be changed due to the introduction of the new disinfectant cleaner.

d) The project will utilize some equipment the company currently owns but is not now using. A used-equipment dealer has offered to buy the equipment.