Sian works for a large game design company and is currently integrating the Havok physics component into a game engine, Unity. At what level in the game development stack is Sian integrating into?

Plugins and Extensions
Game Engine
Programming Language
External Tools

Sian is integrating at the Game Engine level in the game development stack. The Havok physics component is being integrated into the Unity game engine, which is a software platform that provides the necessary tools and capabilities for game development.