Your team is tasked with developing an image classification model to identify whether an image contains a driver's license, passport, or credit card. The data engineering team has already constructed the data pipeline and prepared a dataset with 10,000 images of driver's licenses, 1,000 images of passports, and 1,000 images of credit cards. You are required to use this dataset to train a machine learning model, with labels mapped as ['drivers_license', 'passport', 'credit_card']. Considering these classes are mutually exclusive, which appropriate loss function should you use?