He used the method of scratching into a copper sheet. It is called Intaglio. Intaglio is a technique in printmaking. Copper and zinc are the two materials that are normally used with this kind of medium. Another example of this are collagraphs.
<span>The predominant decorative art style of the 1920s and 1930s, characterized by precise and boldly delineated geometric shapes and strong colours and used most notably in household objects and in architecture.</span>
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I believe it’s A
I hope that helped
