TheScrum Guidedefines an Increment as "a concrete stepping stone toward the Product Goal" that is usable and meets the Definition of "Done": "Each Increment is additive to all prior Increments and thoroughly verified, ensuring that all Increments work together." Option E captures this-new, usable features that build on previous work. Option A (test suite) is a tool, not an Increment. Option B (UML diagrams) is documentation, not working software. Option C (task decomposition) is planning, not a product. Option D (UI design) isn't necessarily usable software. Thus, E best describes an Increment.