During the reign of Jahangir, the technique of 'Nim Qalam' became highly popular. What does 'Nim Qalam' refer to in Mughal miniature painting?

Options:

• A: A technique of using pure gold leafing on the borders of the painting.
• B: A monochrome or sepia-toned drawing with light washes of color.
• C: A collaborative method where one artist drew the outline and another filled the colors.
• D: The practice of painting miniature portraits on imported ivory sheets.

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