It is a kind of malware (malicious software) that criminals install on your computer so they can lock it from a
remote location. This malware generates a pop-up window, webpage, or email warning from what looks like an
official authority. It explains that your computer has been locked because of possible illegal activities on it and
demands payment before you can access your files and programs again.
Which of the following terms best matches the definition?

A.
Ransomware

B.
Adware

C.
Spyware

D.
Riskware

Explanation:
Ransomware is a type of malware that can be covertly installed on a computer without knowledge or intention
of the user that restricts access to the infected computer system in some way, and demands that the user pay a
ransom to the malware operators to remove the restriction. Some forms of ransomware systematically encrypt
files on the system’s hard drive, which become difficult or impossible to decrypt without paying the ransom for
the encryption key, while some may simply lock the system and display messages intended to coax the user
into paying. Ransomware typically propagates as a Trojan.
https://en.wikipedia.org/wiki/Ransomware