I think if To ask Siri she will give up the sheer answer !!
Answer:
It is a good way to protect your artwork.
It was initially part of the frame and mat of wood.
During the renaissance, it was made out of paper.
At the beginning of the 19th century, cardboard was invented. Later on, mats for artwork were mass produced out of cardboard.
Nowadays, there is a digital mat that can be used by professional designers.
Explanation:
Hope this helps!
A and c characteristics are truer
