A multinational retail corporation is embarking on a data-driven initiative to enhance its marketing strategies by understanding customer purchasing behaviors. The corporation has collected extensive transaction data but lacks predefined labels or categories for customer segments. The primary objective is to identify natural groupings within the customer base to enable personalized marketing campaigns. Given the absence of labeled data and the focus on discovering inherent patterns, which of the following statements accurately describes the most suitable machine learning approach for this scenario? (Choose one correct option)