______ is a type of malware that uses encryption to make files unreadable.

______ is a type of malware that uses encryption to make files unreadable.

• A. Trojan
• B. Worm
• C. Adware
• D. Ransomware

Answer: (D)

Ransomware is a type of malware that encrypts files on a device or network, making them unreadable until a decryption key is provided—usually after paying a ransom. The encryption step is what sets ransomware apart from other malware: it directly renders data inaccessible and often threats of data exposure or deletion accompany the demand. This is why it’s the best answer here. In contrast, a Trojan hides malicious activity inside what appears to be legitimate software but doesn’t inherently encrypt files; a worm self-replicates to spread across systems without requiring user action; and adware simply displays unwanted advertisements.

Ransomware is a type of malware that encrypts files on a device or network, making them unreadable until a decryption key is provided—usually after paying a ransom. The encryption step is what sets ransomware apart from other malware: it directly renders data inaccessible and often threats of data exposure or deletion accompany the demand. This is why it’s the best answer here.

In contrast, a Trojan hides malicious activity inside what appears to be legitimate software but doesn’t inherently encrypt files; a worm self-replicates to spread across systems without requiring user action; and adware simply displays unwanted advertisements.