Mina is a programmer that uses specific tools for realistic physics. She is currently utilizing a physics interpreter and will soon focus on character hair. At what level in the stack is Mina?

External Tools
Game Engine
Programming Language
Plugins and Extensions

Mina is currently at the level of using plugins and extensions in her programming language to work on realistic physics. Once she starts focusing on character hair, she may move up to using the physics interpreter within the game engine. The game engine would be considered the next level in the stack, followed by external tools that may be used to further enhance the physics simulations.