Which of the following types of testing is primarily focused on verifying the integration of different modules?

Integration Testing is a phase in software testing where individual modules or components are combined and tested as a group. The primary focus is to identify issues that occur when different modules interact, ensuring that they work together as expected. This type of testing is crucial for uncovering interface defects, data flow problems, and unexpected interactions between integrated components. By verifying that the combined modules function correctly, Integration Testing helps ensure that the system operates as intended in a real-world scenario. Option A (Unit Testing) is incorrect because it focuses on testing individual components or modules in isolation, not their integration. Option B (Black Box Testing) assesses functionality without knowledge of the internal structure and is not specifically focused on integration. Option D (System Testing) validates the complete and integrated software product to evaluate compliance with specified requirements, encompassing but not limited to integration. Option E (User Acceptance Testing) is conducted to determine if the system meets user needs and requirements, rather than focusing on the technical integration of components.