Use the Following Statements to Answer This Question

Use the following statements to answer this question:
I.Discount real cash flows with a real discount rate.
II.Discount nominal cash flows with a real discount rate.
III.Discount real cash flows with a nominal discount rate.
IV.Discount nominal cash flows with a nominal discount rate.

A) I and II are correct.
B) III and IV are incorrect.
C) I and IV are correct.
D) II is incorrect and III is correct.