Which of the following statements is true?

Acceptance criteria for user stories are crucial in defining the specific requirements that a piece of software must meet to be accepted by the user or stakeholder. These criteria often include data definitions such as format, allowed values, and default values, ensuring that the software behaves correctly with the expected data inputs.

Option A is incorrect because user acceptance tests are not usually automated; they are often conducted manually by end-users. Option C is incorrect because acceptance criteria should cover both positive and negative scenarios to ensure comprehensive testing. Option D is incorrect because tests derived from acceptance criteria can indeed be included in the testing quadrants, particularly in the quadrant related to business-facing tests that critique the product.