In the given question line 4 is incorrect because it uses the select command, which selects "pubid and cost" that is already defined inline 3. This statement selects one or more a collection of records from the tables. It also recovers more row across any table that server and correct choices can be described as follows:
In the given choices, except line 3 all were correct because first, it selects column names from the table "book".
After selecting column names it and defines condition were pubid value is 3.
