The discounted payback rule can be best stated as: O a. An investment is acceptable if its discounted payback period is greater than some pre-specified number of years. b. An investment should be rejected if the discounted payback is positive and accepted if it is negative. 0 An Investment is acceptable if its discounted payback period is less than some pre-specified number of years. Od. An investment should be accepted if the discounted payback is positive and rejected if it is negative