In the Nickelodeon series 'The Adventures of Jimmy Neutron: Boy Genius', what specific role does Gizmo the Gear primarily play in the invention process? (Expert)
#1: He is Jimmy's robotic assistant that helps with calculations.
#2: He serves as the central control unit for Jimmy's inventions.
#3: He represents the mechanical operations within the inventions, ensuring all parts work together.
#4: He is a sentient tool that repairs broken inventions automatically.