What type of AI is described as following fixed rules and producing the same output for the same input?

The classification of AI that follows fixed rules and produces the same output for the same input is Reactive AI. This type of artificial intelligence operates based on predefined responses and is unable to learn from past experiences. Reactive AI systems analyze the current situation and respond according to fixed programming without keeping any memory of past interactions. An example of Reactive AI is IBM's chess-playing computer Deep Blue, which evaluated the chessboard positions and made decisions based solely on programmed rules and evaluation functions rather than learning from previous games.

Limited memory AI, on the other hand, uses historical data to inform future decisions, allowing it to adapt and improve over time. Self-aware AI refers to machines that possess self-awareness and understand their own existence and state, which goes far beyond the fixed rule structure of Reactive AI. Theory of mind AI is a concept that describes a system capable of understanding emotions, beliefs, and thoughts, thus enabling more complex interactions with humans. None of these descriptions align with the characteristic of following fixed rules for the same inputs, making Reactive AI the correct choice.