Mike is a network administrator with a small financial services company. He has received a popup window that states his files are now encrypted and he must pay $\mathrm{.}5$ bitcoins to get them decrypted. He tries to check the files in question, but their extensions have changed, and he cannot open them. What best describes this situation?Group of answer choicesMikes machine has been the target of whaling.Mikes machine has a rootkit.Mikes machine has ransomware.Mikes machine has a logic bomb.