Which of the following types of malware MOST likely caused this to occur?

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The help desk received a call from a user who was trying to access a set of files from the day before but received the following error message: File format not recognized.

Which of the following types of malware MOST likely caused this to occur?
A . Ransomware
B . Polymorphic virus
C . Rootkit
D . Spyware

Answer: A