Read the following scenario, and then answer the question below.

an intern notices a problem with a new software package. she then complains to a technician who criticizes the new package. an engineer overhears their criticism, asks some more questions about the problem, and proposes a solution to their supervisor.

who is demonstrating critical thinking?
the intern, who noticed the problem and complained about it
the technician, who criticized the new software package
the engineer, who investigated the problem and proposed a solution
the supervisor, who understood the problem and implemented the idea