Below is the use case for a Recipes database, which is used by restaurant owners to record recipes . Information about ingredients used are stored in the database, including the name and Information is stored about recipes, including the name of the recipe, the author of the The ingredients required for each recipe are also stored, including the quantity of each and their ingredients. price per kilogram of each ingredient. Because some ingredients have the same or similar names, a description of each ingredient is also included ingredient used in the recipe. Each recipe may contain many ingredients, and an ingredient is listed only once for each recipe How many of each of the following are there in the relational schema? Attributes that cannot be NULL as they participate in a Primary Key ' Attributes that are subject to a Referential Integrity Constraint