A patent

	A.	is protected in other countries by making separate applications in those countries.
	B.	a patent is protected for 20 years from the day on which the patent application is filed.
	C.	is limited to art, process, machine, manufacture or composition of matter.
	D.	right is infringed when anyone produces, uses, or sells a patent invention without the permission of the patent owner.
	E.	All of the above