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The correct answer is option (c): Offset printing. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2006, GS Paper 1, as Question 140. It falls under Science & Technology > Printing / Colour Technology.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 1 questions from Printing / Colour Technology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.