Answer:
a. Joint venture
Step-by-step explanation:
A joint venture is the union of knowledge, skills and resources from two or more companies. These companies will also share risk and gains.
Supernova Inc and Alba Inc will keep their company and remain independent. There is no absorbtion or fusion. They will only deal together with the new company in the specific market they agree into for everything else, they are different entities with their own risk, obligation and gains.