What rules are the OSI following when they certif

What rules are the OSI following when they certify products as open source？

A.The software being distributed must be redistributed to anyone else without any restriction.

B.The software force vendors to work on that much harder to hold their market share in the face of viable open source alternatives by competing with proprietary software products.

C.The source code must be made available.

D.The license can require improved versions of the software to carry a different name or version from the original software.