Correct Answer: DTo execute a batch prediction on 100 million records in a BigQuery table with a custom TensorFlow DNN regressor model, the most suitable approach is to utilize a Dataflow pipeline. By loading the TensorFlow SavedModel in the Dataflow pipeline, using the BigQuery I/O connector with a custom function to perform the inference within the pipeline, and writing the results back to BigQuery, you can effectively handle large-scale data and leverage the distributed processing capabilities of Dataflow. This method ensures efficiency and scalability for handling a large volume of data and performing complex model inferences.