The distinctive 'Red and Black Ware' (or Black-and-Red Ware) of the Chalcolithic and Harappan periods was produced using which of the following pyrotechnological methods?

Options:

• A: Double-firing, where the pot was first fired in an open pit and then refired in a closed kiln with organic matter.
• B: Inverted firing, where the pot was placed upside down in the kiln, causing the interior and the rim to turn black due to reduction, while the exterior turned red due to oxidation.
• C: Applying a manganese-rich slip to the top half of the vessel and an iron-rich slip to the bottom half before firing in a uniform oxidizing atmosphere.
• D: Firing the pottery in a completely sealed, oxygen-deprived kiln at extremely high temperatures exceeding 1500 degrees Celsius.

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