Match List-I with List-II. List-I: A. Trojan, B. Cookie, C. Spyware, D. Firewall. List-II: I. A network security system designed to protect a trusted private network from unauthorized access or traffic originating from an untrusted external network. II. Records and sends the collected information to an external entity without the consent or knowledge of a user. III. A small file or data packet, which is stored by a website on the client's computer. IV. A malware that looks like a legitimate software and once it tricks a user into installing it, it acts pretty much like a virus or worm.