A core principle of the model validation process is independence. According to supervisory guidance (such as OCC Bulletin 2011-12 / SR 11-7), model validation should be conducted by staff who are independent of model development and use, in order to provide an objective, unbiased assessment of the model. Therefore, requiring model developers to be involved in the model validation team contradicts this core principle of independence.

Choice A is a valid guidance known as the 'use test', ensuring models are actively used in the bank's decision-making and risk management. Choice B is also valid, as comprehensive documentation must clearly highlight a model's limitations, weaknesses, and areas where it does not work effectively. Choice C is the exception, making it the correct answer.