Who owns the patent after purchase?

About patent ownership, the mistake is ().

A the right to apply for a patent for a service invention-creation and the patent right belong to the unit.

Where two or more applicants apply for a patent for the same invention-creation, the patent right shall be granted to the person who invented it first.

C for an invention-creation jointly completed by two or more units or individuals, unless otherwise agreed by the parties, the right to apply for a patent and the patentee shall be owned by the completing unit or individual.

D unless otherwise agreed in the power of attorney, the right to apply for a patent and the patent right of an invention-creation entrusted by a unit or individual to another unit or individual shall belong to the unit or individual that completed or jointly completed it.

Correct answer: b