Which of the following is an example of an incremental cash flow? Select one: O a. The rent on a warehouse which is currently being utilized by an existing project. O b. None of these is an example of an incremental cash flow. O c. The cost to purchase a new machinery that is required for an upcoming project. O d. The interest charges to be paid to finance an upcoming project. O e. The consulting fee your firms has promised to pay for analyzing a potential project