Answer: Collect a set of labeled feedback forms, train a custom model using Azure Custom Document Understanding, and evaluate its performance on a separate set of test forms.

To design and train a custom model for extracting key information from customer feedback forms, you should first collect a set of labeled feedback forms that represent the specific types of information you want to extract. Then, you can use Azure Custom Document Understanding to train a custom model on these forms. After training, you should evaluate the model's performance on a separate set of test forms to ensure it meets your accuracy requirements. Option B is incorrect because using prebuilt models without customization may not capture the specific information required from the feedback forms. Option C is incorrect because manually extracting data and training a custom machine learning model is not the recommended approach for this use case. Option D is incorrect because creating a new Azure AI Search service and configuring it to use a custom skill is not the appropriate approach for training a custom document intelligence model.

Author: LeetQuiz Editorial Team