Discussion
Photocopied document can be connected specifically with a photocopier with the analysis of :
Answer: A
The analysis needed is of toner and defect marks on the drum.
Defects on the drum, platen glass or other parts of a photocopier leave marks (trash marks) that repeat on every copy it makes. Combined with analysis of the toner, which differs between makes and models, these marks can link a copy to one particular machine.
Defect marks alone, or toner alone, give weaker evidence, since toner may be shared by many machines and marks change as parts are cleaned or replaced. The font of the original document says nothing about the photocopier used.
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