Documentation is a substantial part of the evidence for Service Management What is a best practice relating to documentation?

Documentation is a substantial part of the evidence for Service Management What is a best practice relating to documentation?
A . Documentation should be kept at least five years for auditing purposes.
B. Documentation should be protected from damage due to IT related disasters.
C. Documentation should be stored at a central place and be only accessible via procedures
D. Documentation should refer to the requirements of ISO/EC 20000 for audit purposes.

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Answer: B