📘 Explanation:
✅ B. Detailed Acceptance Criteria
Clear, detailed acceptance criteria ensure that developers and testers understand exactly what needs to be built and validated.
Vague or incomplete criteria often lead to misaligned expectations, resulting in defects.
✅ D. Use Test Scripts to Define Test Classes
Aligning test classes with test scripts ensures that automated tests reflect real-world use cases and business scenarios.
This improves test quality and coverage of edge cases, reducing the chance of defects slipping through.
❌ Why not the others?
A. Increase code coverage to 95%
→ High code coverage does not guarantee quality. You can have 95% coverage and still miss critical logic if the tests are superficial or not aligned with business needs.

C. Test analyst must create test classes
→ While collaboration is important, test classes are typically written by developers. Analysts should define test cases and scenarios, but not necessarily write Apex code.

A & B