Copies of the document should be used during the investigation and trial and should be kept in the same file where the original is kept. This is the best practice while handling documentary evidence.
Option: D
Explanation:
When documentary evidences are being handled by someone copies of the original document should be made and used during the investigation and kept in the same file with the original one. If summary of the original document made there might be lack of main investigation point. So, take care of it.
If copies not prepared then by any chance original document may lost and will ruin the whole investigation process. So, it is very necessary to prepare a copy of original document and use of that for investigation.