Bill is leaving work when a co$-$worker asks him to drop off a package at the post office on his way home. The co$-$worker explains that he must work late and can$$t get to the post office before it closes. Bill stops at the post office and is met by police officers with drug$-$sniffing canines who discover the package his co$-$worker gave him contains cocaine.

Bill is guilty of what kind of possession?

knowing possession

mere possession

concurrent possession

constructive possession