Final answer:
A worm is a type of computer virus that takes advantage of file transport methods, such as email, to spread on its own. Option A is correct.
Step-by-step explanation:
A worm represents a distinct category of computer virus distinguished by its autonomous propagation through file transport channels, notably utilizing email as a primary vector for dissemination. In contrast to conventional viruses, worms circumvent the need to attach themselves to pre-existing files or programs for infection. This autonomous capability enables worms to replicate and proliferate independently, capitalizing on vulnerabilities within a computer's network or operating system.
Operating with a self-contained mechanism, worms possess the ability to traverse networks and systems, exploiting security loopholes without relying on host files for transmission. The absence of a host dependency sets worms apart from other types of viruses, allowing them to initiate and sustain infections without piggybacking on specific programs. The modus operandi of worms involves seeking out and exploiting weaknesses in computer networks, utilizing various transmission channels such as email to efficiently propagate.
This inherent self-replicating nature enhances the speed and scope of worm infections, making them potent threats in the realm of cybersecurity. By exploiting vulnerabilities autonomously, worms pose challenges for detection and containment, necessitating robust cybersecurity measures to safeguard against their insidious spread and potential harm to computer systems.