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As a junior data scientist at a financial services company, you're tasked with developing a logistic regression model to categorize incoming customer text messages into two categories: 'important/urgent' and 'important/not urgent'. The model's performance is critical for timely customer service responses. Given the binary nature of the classification task and the need for probabilistic outcomes between 0 and 1, which loss function is most suitable for evaluating your model's performance? Choose the best option.