[Solved] Figure 9-17 -Figure 9-17 shows that for this perfectly competitive firm,the profit-maximizing output level is A)0. B)25. C)75. D)200. Windows 7: Windows 7 is an operating system produced by Microsoft as part of the Windows NT family of operating systems, known for its improved interface and enhanced features over its predecessors. Child Pornography: Illegal material that visually depicts minors under the age of 18 engaged in sexual acts or in sexually explicit poses. IT Intern: A temporary, usually entry-level position within an information technology department where the individual gains experience and knowledge of IT operations. External Drive: A portable storage device that can be attached to a computer through a USB or another interface for the purpose of storing and accessing data.