Discussion
Indented writing means :
Answer: D
Indented writing means sub-surface impressions.
When someone writes on a sheet of paper resting on others, the pressure of the pen leaves colourless impressions, indentations, on the sheets underneath. These can reveal what was written on a missing page. They are recovered by oblique lighting, which casts shadows in the grooves, or more sensitively by an electrostatic detection apparatus (ESDA), which can reveal indentations several sheets down.
Invisible writing uses secret inks, coding is encryption of content, and marginal writing is writing in the margin. None is the same as indentations left by pressure.
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