What Is the BEST option regarding the level of detail and documentation required for test cases in the project?

As a Test Analyst you are involved in the early stages of an acceptance test for a Product Data Management system. You are asked to write test designs and test cases based on use cases. An early version of the system is already available. It is expected that many things will change (including the user interface) during implementation of the new version.

The tests will be conducted by end-users with much domain knowledge who have also been involved in the project defining the user requirements (in the format of use cases) and reviewing other documentation.

What Is the BEST option regarding the level of detail and documentation required for test cases in the project?
A . Detailed low-level test cases since many re-runs of the tests are expected.
B . High-level test cases supported by low-level test cases to allow for traceability and enable future changes.
C . Low-level test cases only since the end-users have extensive domain knowledge.
D . High-level test cases only since the end-users have extensive domain knowledge and many changes are expected

Answer: D