Question

Which of the following best describes a 'Ransomware'?

A Software that displays unwanted advertisements in between page browsing
B Malicious software that encrypts victim's files and demands payment for the decryption key
C A program that secretly monitors user activity and keeps a log of the same
D Software that replicates itself across a network and floods the network until a payment demand is fulfilled
E A tool used for authorized network penetration testing
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