Malware: ● Software designed to perform an unwanted illegal act via the computer network . ● Can be classified on the basis of execution : ◦ Virus: Infects other programs by modifying them to include a possibly evolved copy of itself. ◦ Worm: Copy themselves from system to system, rather than infiltrating legitimate files. ◦ Trojan: Impairs the security of a system and is used to create back-doors on computers belonging to a secure network. ◦ Hoax: It invades the system and deletes an important file when a program is run to correct the harming system. ◦ Spyware: Invades a computer and monitors a user’s activities without consent. So, option 4 is NOT correct .