Question $3(2$ points$)$

$($Learning Outcome $3)$ According to the public use doctrine for patents, $$

the invention will come into the public domain once its term period has expired.

an invention cannot be used in the public domain prior to its being granted a patent.

a patent will not be granted if the invention was already in public use for one year before filing the application.

the inventor has to test his invention in the public domain to measure its validity before being granted a patent.