Problem 1 [20 points]. The ER model for a movie production is shown in the following figure. Map this ER model to a relational model presentation. Discuss the possible loss of semantics. Clearly indicate the primary- foreign key relationships and specify NOT NULL declarations where necessary. (0.1) (0.1) ACTOR ALSO A ALSO A DIRECTOR (0..m) (0 2) PRODUCER pro-act act-dir act-pro (0.1) PERFORMS IN (0.1) LEAD ROLE DIRECTOR mov act mov-Id PRODUCER act-mov (1.1) (LA) DIRECTS PRODUCES mov-dir mov pro dir-mov Pro-mov (0.n) (0 m) MOVIE