Which of the following statements about Net Present Value (NPV) and Internal Rate of Return (IRR) methods are correct?

(1) An investment with a positive NPV is financially stable

(2) IRR is a superior method to NPV

(3) The graph of NPV against discount rate has a positive slope for most projects.

(4) NPV is the present value of expected future net cash receipts less the cost of investment.

A. (1),(2),(3) and (4)

B. (2) and (3) only

C. (1) and (4) only

D. (1) and (3) only