What is the name of the address that is used by a router (at Layer 3 ) to identify specific devices?

One reason for the success of the Web is that HTML has made it easy for non-programmers to write and edit code without being ensnarled by ______ violations.

A. code B. program C. syntax D. logic

Assume a schema for the following set of relations :

Shelves(Sid, Size) with primary key Sid
Items(Iid, Man, Name, Space, Cost, Price) with primary key Iid
Stores(Iid, Sid, Remove Date) with primary key Iid

(a) Give a SELECT statement that returns all rows of Shelves. (b) Give a SELECT statement that returns all rows of Shelves corresponding to shelves that have a size greater than 100. (c) Give a SELECT statement that returns the manufacturer and name in all rows of Items corresponding to items whose retail price is more than twice its cost. (d) Give a SELECT statement that returns the manufacturer and name in all rows of Items corresponding to items stored on the shelf whose Sid has value 12345. (e) We would like the database schema to enforce the restriction that, for any item stored on a shelf, the space occupied by the item not exceed the size of the shelf. Use SQL to do this.