plssss solve i dont have much time

Problem 3: (8 points) Consider the following 3 NF relations about a BALADNA BIG STORE: CUSTOMER (Cust ID, Name, Address) ORDER (Order ID, Date) INVENTORY (Inv ID, Item_name, Weight) SHOPPING_CART (Cart ID, Cust_ID, Order ID, INV ID, Qt y ) a. Determine and indicate the Foreign keys these relations? justify your Answer. ( 3 ) points) b. Draw an E-R diagram for these relations. ( 3 points) c. Explain the assumptions you made about cardinalities in your answer to part b? ( 2 points)