Which ethical system would limit a defense attorney's actions to only those allowed by a strict adherence to the Model Rules?

The ethical system that would limit a defense attorney's actions to strict adherence to the Model Rules is deontological ethics, specifically the concept of duty-based ethics. This approach emphasizes the importance of following rules and obligations, prioritizing moral duties over the consequences of actions. In this context, a defense attorney would be bound to comply with the Model Rules of Professional Conduct, ensuring their actions align strictly with established legal and ethical standards.