A&B Enterprises is trying to select the best investment from among four alternatives. Each alternative involves an initial outlay of $100,000. Their cash flows follow:

Year	A	B	C	D
1	$10,000	$50,000	$25,000	$0
2	20,000	40,000	25,000	0
3	30,000	30,000	25,000	45,000
4	40,000	0	25,000	55,000
5	50,000	0	5,000	60,000

Evaluate and rank each alternative based on a) payback period, b) net present value (use a 10% discount rate), and c) internal rate of return.