where should this documentation be stored, according to best practice?

After the Linux technician has completed the server configuration documentation, where should this documentation be stored, according to best practice?

A.
In an approved fire-proof container, located in a secure off-site facility

B.
In a binder, securely stored in an area located near the server

C.
In a predetermined secure location on-site, but not in the server room

D.
In an office, to be filed and labeled appropriately with the rest of the system documentation