Answer:
b. ​patent infringement.
Explanation:
Patent infringement -
It refers to as illegal practice , where the various goods and services are produced without the permission of the patent holder , is referred to as patent infringement .
The practice can get the person to prison as well .
As a proper permission is required by the patent holder to produce the goods and services .
Hence , from the given scenario of the question ,
The correct answer is patent infringement .