How are language preferences set for IBM Watson Natural Language Classifier (NLC)?

The correct answer is that the language parameter is specified in the training metadata file when creating a classifier. This means that when you are setting up your Natural Language Classifier, you can define the language the classifier is expected to understand by including it in the metadata of your training data.

By specifying the language in the training metadata, you ensure that the classifier is aware of the linguistic nuances and characteristics of that particular language. This is crucial for the model's performance, as it enables the classifier to effectively interpret and handle inputs in the specified language.

Furthermore, options that indicate automatic detection of the language or limitations to only English do not accurately represent how the NLC operates. While the classifier can be trained on various languages, explicitly setting the language in the training metadata file ensures proper handling and increases reliability and accuracy in language processing.