When a 104 K data file is written to disk with a protection level of N+2n, what is the protection overhead of the total disk space consumed by the file?

When a 104 K data file is written to disk with a protection level of N+2n, what is the protection overhead of the total disk space consumed by the file?
A . 0.33
B . 0.5
C . 0.67
D . 0.8

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Answer: C