Black-box testing is a test technique that investigates the input vs. output behavior of a software system, without considering its internal structure or implementation. Therefore, option B is correct. Option A is incorrect, as it describes white-box testing, which focuses on the internal structure or implementation of a software system. Option C is incorrect, as it describes exploratory testing, which relies on the testers' intuition and experience. Option D is incorrect, as it describes integration testing, which tests the interfaces and interactions between components or systems.
References: [Certified Tester Foundation Level Syllabus], Section 4.1