Can someone define gsm for (give me the meaning and brief explanation)

What are three software programs for mobile computing?

Anetwork security application that prevents access between a private and trusted network and other untrusted networks

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