Consider the following statements: 1.Diabetes insipidus causes diuresis, i.e., urine is passed out several times more than in a normal person. 2.A person with diabetes insipidus suffers from very low or no output of vasopressin. 3.Such diabetic patients drink large quantity of water. 4.Vasopressin is secreted by hypothalamus and stored in posterior pituitary. Which of the above statements is/are correct?