An npv of zero implies that an investment's a. cost exceeds the present value of its cash inflows b. cost is equal to the present value of its cash inflows c. irr is greater than the firm's required rate of return d. present value of cash inflows are negative e. present value of cash inflows exceed the investment's cost

David paid $975,000 for two beachfront lots in coastal south carolina, with the intention of building residential homes on each. two years later, the south carolina legislature passed the beachfront management act, barring any further development of the coast, including david's lots. when david files a complaint to seek compensation for his property, south carolina refuses, pointing to a passage in david's own complaint that states "the beachfront management act [was] properly and validly designed to south carolina's " is south carolina required to compensate david under the takings clause?