Final answer:
Macro viruses infect Microsoft Office files and install themselves when users click files. They exploit vulnerabilities in Microsoft Office applications, using the macro programming language to execute malicious actions.
Step-by-step explanation:
Macro viruses usually infect Microsoft Office files and install themselves when users click files. They are specifically designed to exploit vulnerabilities in Microsoft Office applications and use the macro programming language to execute malicious actions. When a user clicks on an infected file, the macro virus is activated, allowing it to spread and potentially cause harm to the user's computer.
A macro is a series of commands and instructions that can automate tasks within an application. However, in the case of macro viruses, they contain malicious code that can perform unauthorized actions, such as deleting files or spreading to other documents.It is important for users to be cautious when opening files from unknown or untrusted sources, as this is a common way for macro viruses to spread.Macro viruses are a type of malware that typically infect Microsoft Office files. The correct answer to the question is a. install themselves when users click files. Once a user opens or clicks on the infected file, usually a Word or Excel document, the macro virus executes and can spread to other documents. Contrary to the other options provided, macro viruses do not necessarily delete files or install themselves upon reboot; they are designed to be triggered when an infected document is activated by the user.