Before copy machines, it was common to use for the original drawing, due to the durability and transparency of the media, although plastic film was also common in some settings.

Vellum

Explanation:

Vellum is a fine parchment paper made of calfskin or lambskin. The membrane of these animals skin is processed to make a vellum.

The word 'vellum' is derived from the Latin word 'vitulinum' which means 'made of calf.'

Nowadays, a vellum is made using cotton and pulp. These papers were used to write or to print on. These are high-quality papers and thus, in arts used for drawing. These papers have a long durability and are transparent.

So, the correct answer is vellum.

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