Which of the following are valid reasons of applying use cases to design test cases?

Emphasizes use of the software system from the users' perspectives as opposed to use based on the software's functional design.

Replaces other test case design techniques and therefore creates a smaller, more efficient set of comprehensive test cases.

Provides an effective white box testing method to be used to replace a gray box testing method.

Provides equivalence and boundary system tests otherwise will go untested.

Provides an inventory of test cases for unit testing.