Which transmission means is commonly used by viruses?

• A. Generally transmitted through file downloads, disk/flash drives, and email attachments
• B. Only physical theft
• C. Purely through memory corruption
• D. Through secure channels only

Answer: (A)

Viruses most often spread through channels that involve user interaction with files and removable media. This includes downloading infected programs or files from the internet, opening or executing attachments in emails, and using infected disks or USB drives. These vectors work well because they leverage legitimate-looking content that users trust or unintentionally enable, allowing the malicious code to run and replicate to other systems or files.

The other ideas don’t fit because a virus isn’t limited to hardware theft as a sole method of spread, nor is it primarily propagated by memory corruption (that’s a vulnerability or bug exploited to execute code, not a transmission channel). And viruses don’t require “secure channels only” to propagate; in fact, many infections exploit common, insecure, or trusted channels such as email, downloads, and removable media.