In Persian tilework, what does the 'haft-rangi' (seven-colour) technique refer to?

• A Cutting seven-piece tile mosaics by hand
• B Painting multiple glaze colours onto single square tiles before firing ✓
• C Layering seven translucent glazes over gold leaf
• D Alternating seven bands of coloured brick

Haft-rangi (cuerda seca) tiles let Safavid builders cover vast surfaces faster than cut-mosaic work.