ralized into an Item entity. meralized into a User entity.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Q2:

Consider the following set of requirements.
A 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 Book, Periodical, DVD, Referenceltem, Borrowingltem, RegisteredUser, and TemporaryUser as entities. Which
of the following statements are correct about a possible EER model for this set of requirements?
I. Book, Periodical, and DVD can be generalized into an Item entity.
II. Referenceltem and Borrowingltem can be generalized into an Item entity.
III. RegisteredUser and TemporaryUser can be generalized into a User entity.
O Only I and III
O All three
O Only Il and II
O Only I andII
Transcribed Image Text:Consider the following set of requirements. A 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 Book, Periodical, DVD, Referenceltem, Borrowingltem, RegisteredUser, and TemporaryUser as entities. Which of the following statements are correct about a possible EER model for this set of requirements? I. Book, Periodical, and DVD can be generalized into an Item entity. II. Referenceltem and Borrowingltem can be generalized into an Item entity. III. RegisteredUser and TemporaryUser can be generalized into a User entity. O Only I and III O All three O Only Il and II O Only I andII
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