If the risk of an investment project is different from the risk of the company as a whole, then:

a$.$The market rate of return should be used as the discount rate of the project

B$.$The discount rate of the project must be adjusted according to the risk of the project's cash flow

C$.$The discount rate of the project must be adjusted according to the source of the project financing

D$.$The average discount rate used for all previous projects shall be used as the discount rate for new projects

E$.$The initial cost of the project should be increased or reduced to take into account the increased or decreased risk.