Based upon the contents of the BOOKS table, which line of the following SQL statement contains an error?
1. SELECT title, pubid, cost, retail
2. FROM books
3. WHERE (pubid, cost)
4. (SELECT pubid, cost)
5. FROM books
6. WHERE pubid = 3);

Select the correct answer. a company wants to use online methods to target more customers. it decides to conduct a market research by collecting the data of a few customers with their consent. they want to track data of the sites that their customers frequently visit. which software can the company? a. spyware b. bots c. adware d. trojan horse e. rootkits