The following conversation took place between one of the authors of this text and his son Jack, when Jack was 4 years old. DADDY:"Jack, what is ?" JACK:"3." DADDY:"Jack, what is " JACK:"4. And Daddy, string plus zero equals string!" What property of addition did Jack recognize?

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