If an Invention Was Known or Used by Others in This

Multiple Choice

If an invention was known or used by others in this country, or patented or described in a printed publication in this or a foreign country, before the invention thereof by the applicant for patent then:

A) the invention can only be patented for 10 years
B) the invention can only be patented for 5 years
C) the invention cannot be patented without a 5 year grace period
D) the invention cannot be patented
E) none of the other choices are correct