6 3. a) Draw an ER diagram for the following Video Centers. Video Centers of Dhaka, Ltd., is a chain of movie DVD rental stores. It must maintain data on the DVDs it has for rent, the movies recorded on the DVDs, its customers, and the actual rental. Each DVD for rent has a unique serial number. Movie titles and customer numbers are also unique identifiers. Assume that each movie has exactly one "star." Note the difference in the year that the movie was originally filmed and the date that a DVD-an actual diskwas manufactured. 2 4 b) Suppose you are given a relation R(A, B, C, D, E) and functional dependency FD: ( AB, BC, CD, DA) Check Whether it is in 2NF or 3NF or not