What is the BEST alternative if you discover that a rootkit has been installed on one of your computers?

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What is the BEST alternative if you discover that a rootkit has been installed on one of your computers?
A . Copy the system files from a known good system
B . Perform a trap and trace
C . Delete the files and try to determine the source
D . Reload from a previous backup
E . Reload from known good media

Answer: E