A retail company is embarking on a machine learning project to enhance its marketing strategies by analyzing customer purchase history. The goal is to identify distinct groups of customers with similar buying patterns without relying on any pre-labeled data. This approach is expected to uncover hidden patterns and insights that can lead to more personalized marketing efforts. Given the company's constraints of limited labeled data and the need for scalability across thousands of customers, which of the following scenarios best exemplifies an unsupervised learning task in this context? (Choose one correct option)