Probability — moments from a 2x2 joint table

The joint distribution of two random variables X and Y is given below: X=0: $\alpha_1$ (Y=-1), $\alpha_2$ (Y=1); X=1: $\alpha_3$ (Y=-1), $\alpha_4$ (Y=1); where $\alpha_i\ge0$ for all $i$ and $\sum_1^4\alpha_i=1$. Which of the following are correct? 1. $E(X^r)=\alpha_3+\alpha_4$, for all $r$. 2. $E(XY)=\alpha_4-\alpha_3$. 3. $E(XY)^{2n}=\alpha_3+\alpha_4$, for all $n$. Select the correct answer using the code given below.