which one is correct?

Suppose there is no arbitrage in the economy. Which of the following statement are true? C] A negative~cost portfolio (one that delivers a positive cashow at date 0) must have a strictly negative payoff in one of the states at date 1. C] A zero-cost portfolio that has a positive payout in some state, must have a strictly negative payout in some other state. C] There exists a strictly positive SDF, m, such that the price of any asset is given by P = E[X$m] C] A zerovcost portfolio that has a strictly negative payout in some stateI must have a strictly positive payout in some other state