What are the types of inventions which are no patentable in India?

A. Invention which is frivolous or which claims anything obviously contrary to well established natural laws

B. An invention the primary or intended use or commercial exploitation of which could be contrary to public order or morality or which causes serious prejudice to human, animal or plant life or health or to the environment

C. The mere discovery of scientific principle or the formulation of an abstract theory or discovery of any living thing or non-living substance occurring in nature

D. All the above

Answer: Option D