Gary Is Fascinated by a New Device That Uses a GPS-Like

Multiple Choice

Gary is fascinated by a new device that uses a GPS-like tracker to help owners locate their pets.He purchases the product,disassembles it,and uses it as a pattern for a similar device.The new device uses a less expensive casing,but otherwise has duplicated the technology.What legal concept may be represented in this action?

A) a copyright violation
B) a trademark violation
C) a patent violation
D) a fair use violation