A computer virus is a software program which has the essential ability to

Correct option is D

A computer virus is a type of malicious software program that has the ability to replicate itself and infect other software or files. It typically performs harmful actions such as damaging data or programs. Additionally, it has the ability to clone itself, which allows it to spread across the system or network. The key feature of a virus is its ability to replicate and propagate without the user's consent, often causing various issues, from slowing down the system to corrupting important files.
Important Key Points:
1. Replication: A virus has the essential ability to clone itself, enabling it to spread and infect other programs or files.
2. Damage to Data: Viruses can damage data by corrupting or deleting files, leading to data loss or system malfunctions.
3. Damage to Programs: A virus can also affect software programs, causing them to malfunction or become unusable.
4. Propagation: The virus can spread to other systems or files, typically without user awareness, leading to widespread damage.