Marnie is using TinkerCAD to create assets for a video game. At what level of the game development stack is Marnie currently working?

Plugins and Extensions
External Tools
Programming Languages
Game Engine

Marnie is currently working at the level of external tools in the game development stack. TinkerCAD is a 3D modeling tool that is often used to create assets for video games, which falls under the category of external tools within the game development process.