What is a defining feature of Ransomware?

A defining feature of ransomware is that it demands payment for the return of data. Ransomware typically encrypts files on a victim's system, making them inaccessible until a ransom is paid to the attacker. This type of malware is specifically designed to extort money from individuals or organizations by holding their data hostage. The payment is usually demanded in cryptocurrency to maintain anonymity, and it may come with threats of data deletion or permanent loss if the ransom is not paid by a certain deadline.

The other options, while potentially related to other types of malware or security threats, do not capture the essence of what makes ransomware unique in the cybersecurity landscape.