The correct option is D Ransomware
Ransomware is a type of malicious software when infected restricts the user access until a ransom is paid to unlock it. Ransom prices vary depending on the ransomware variant and the price or exchange rates of digital currencies. The most dangerous ransomware attacks are caused by WannaCry, Petya, Cerber, Locky and CryptoLocker ransomware. These are created by scammers who are highly knowledgeable in computer programming. It can enter the PC through an email attachment or through the browser if a person happens to visit a website that is infected with this type of malware.