Which of the following represents good testing practice for testers, irrespective of the software lifecycle model used?

Which of the following represents good testing practice for testers, irrespective of the software lifecycle model used?
A . They should start test analysis when the corresponding development level is complete.
B . They should be involved in reviewing requirements or user stories as soon as drafts are available.
C . They should ensure that the same test objectives apply to each test level.
D . They should minimize the ratio of development levels to test levels to reduce project costs.

Answer: D