When analyzing a document, experts use peculiar technologies and techniques for each type in question, so as not to damage these documents. In labo...

When analyzing a document, experts use peculiar technologies and techniques for each type in question, so as not to damage these documents. In laboratories, the most common to be used is:

Non-destructive techniques, with magnifying glasses and optical microscopes for visual analysis.
Immersion techniques in water, for overwriting observation.
Automated equipment without human observation interference.
Sometimes, the destruction of the document using abrasive techniques.
A) Non-destructive techniques, with magnifying glasses and optical microscopes for visual analysis.
B) Immersion techniques in water, for overwriting observation.
C) Automated equipment without human observation interference.
D) Sometimes, the destruction of the document using abrasive techniques.