Answer:
4.To keep other from reproducing their idea .
Step-by-step explanation:
It is regard as an exclusive right own on a invention .The inventor must disclosed the technical information about the product to the public before a patent is granted .
It is the legal authorization given to an inventor for sharing his intellectual property to the public this also restrict others from making ,using or selling the invention for a limited .
there are 3 type of patents ,Utility patents design patents and plant patent.