Passage: In 1991, Apple introduced the PowerBook, replacing the "luggable" Macintosh Portable with a design that set the current shape for almost all modern laptops. The same year, Apple introduced System 7, a major upgrade to the operating system which added color to the interface and introduced new networking capabilities. It remained the architectural basis for the Classic Mac OS. The success of the PowerBook and other products brought increasing revenue. For some time, Apple was doing incredibly well, introducing fresh new products and generating increasing profits in the process. The magazine MacAddict named the period between 1989 and 1991 as the "first golden age" of the Macintosh.Apple believed the Apple II series was too expensive to produce and took away sales from the low-end Macintosh. In October 1990, Apple released the Macintosh LC, and began efforts to promote that computer by advising developer technical support staff to recommend developing applications for Macintosh rather than Apple II, and authorizing salespersons to direct consumers towards Macintosh and away from Apple II. The Apple IIe was discontinued in 1993.

Question: What version of Apple computer brought in more money after the release of System 7?
PowerBook