4. Write the business rules against the following E-R diagram. 5 marks movie_cast act_id mov_id role 81 integer integer char (30) actor act_id act_fname act Iname act_gender integer char (20) char (20) char (1) genres gen_id gen_title integer char (20) director dir_id dir_fname dir_Iname movie y mov_id integer mov_title char (50) mov year integer mov time integer mov_lang char (50) mov dt rel date mov_rel_country char (5) integer char (20) char (20) movie_genres mov_id gen id integer integer 00 18 18 movie_direction dir_id mov id rating mov_id integer rev_id integer rev_stars integer num_o_ratings integer integer integer reviewer Prev_id rev_name 81 81 integer char (30) w3resource.com