What is the "Best Evidence Rule"?

What is the "Best Evidence Rule"?
A . It states that the court only allows the original evidence of a document, photograph, or recording at the trial rather than a copy
B . It contains system time, logged-on user(s), open files, network information, process information, process-to-port mapping, process memory, clipboard contents, service/driver information, and command history
C . It contains hidden files, slack space, swap file, index.dat files, unallocated clusters, unused partitions, hidden partitions, registry settings, and event logs
D . It contains information such as open network connection, user logout, programs that reside in memory, and cache data

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Answer: A