QuestionSuppose the moment generating function of a random variable XX is given by MX(t)=e2t2M_X(t)=e^{2t^2}. Let X1,X2,X3,X4X_1,X_2,X_3,X_4 be i.i.d. samples with distribution XX and Y=X1+X2+X3+X4Y=X_1+X_2+X_3+X_4. Which of the following options is true?