What type of process forms engraved patterns that are reverse of the masks patterns?

What type of process forms engraved patterns that are reverse of the masks patterns? Correct Answer Optical lithography using negative resists

Optical lithography uses two types of photo resists, Positive and negative resists. While the positive resists result in patterns same as that on the mask, the negative resists engrave reverse patterns. For negative resists the exposed regions becomes less soluble.
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