David designed a dating app that he hopes will be his ticket to becoming a tech millionaire. He shares the code for the app with a potential investor, Paul. Paul likes the concept so much that he decides to develop his own app using Paul's software code without Paul's permission. Paul's use of the code is:

Select one

A$.$ Patent infringement

B$.$ Violation of a trademark

C$.$ copyright infringement

D$.$ None of the above