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What is the regulation of a lac operon by a repressor known as?

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What is the regulation of a lac operon by a repressor known as?

(a) Neutral regulation

(b) Positive regulation

(c) Mixed regulation

(d) Negative regulation

This question was posed to me in an international level competition.

I need to ask this question from Molecular Basis of Inheritance in chapter Molecular Basis of Inheritance of Biology – Class 12

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The correct option is (d) Negative regulation

Easiest explanation: The regulation of a lac operon by the repressor is known as negative regulation. At rare occasions, lac operons are also observed to be under the control of positive regulation. In negative regulation, the operon cannot transcribe the RNA polymerase enzyme.

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