In the context of Disciplined Agile (DA), an Epic is a large user story that represents a significant piece of work that usually requires substantial effort and may span multiple iterations or sprints to complete. Epics are often too large to be completed in a single iteration and are typically broken down into smaller, more manageable user stories. Option A (a collection of smaller user stories) is partially correct because epics are often decomposed into smaller user stories, but option B provides a more precise definition as it emphasizes the size and effort required for completion. Options C and D are not correct in the DA context; they describe different types of analysis tools or techniques.
