3. Determine the contents of array a after the following statements are executed. (a) a b = eye (3,3); = [1 2 3]; a (2, :) = b; (b) a eye (3,3); b = = [4 5 6]; a (:,3) = = b'; (c) a = eye (3,3); b = = [7 8 9]; a (3, :) = b ([3 1 2]);