Wait, I'm a little confused. The question says the RMSE needs to be calculated, but if the error is always 1, wouldn't that just be the square root of the mean of the squared errors, which is 1? I'm not sure I fully understand how to approach this.
Ah, I think I've got it! Option C looks like the right choice - it uses grep to search the log file for the IP address and redirects the output to the specified file.
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