What is a convection Islamic artists used to create tughras?

A.Calligraphers created lines that interlace and illuminators added complex abrabesques

B.llluminators depicted highly realistic animals hidden among floral designs.

C.llluminators painted irregular patterns using pastel colors.

Or D.Calligraphers created the same tughra for each sultan to emphasize the relationship of one sultan to the next.

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