library contains books, periodicals, and DVDs (no items of other types are available and a given item belongs to only a single category). All these items can be used by the user of the library. Some...

•  library contains books, periodicals, and DVDs (no items of other types are available and a given item belongs to only a single category). All these items can be used by the user of the library.


• Some of the items (books, periodicals, and DVDs) are only reference items, and others can be borrowed by the users.


• There are two types of users; registered users and temporary users. While registered users can borrow up to 100 items, the temporary users can borrow only 2 items at a time.

In the initial work of the EER modeling, your teammates have identified Item, User, and ItemCopy as entities.Which of the following statements are correct about a possible EER model for this set of requirements?

1. The specialization/generalization hierarchy for items that involve borrowing items and reference items has an optional participation constraint.


2. The specialization/generalization hierarchy for items that involve the books, periodicals, and DVDs has a mandatory participation constraint.


3. The user entity will have specializations registered users and temporary users.