5. Which of the following four assumptions are part of the classical regression assumptions we discussed in class? i) Elei] = 0 ii) Var(e;) = 02 iii) Elciej = 0 for i = j iv ) &; ~N (0, 02 ) a) i) and iv) b) i) and iii) c) i), ii), and iii) d) i), ii), iii), and iv)