An agile team has started to worry because lately they have seen an increase in...

The team should move to test-driven development as defects are not being detected during testing.

The team should account for the increased problems in their velocity forecasts since unexpected changes occur in agile projects.

The team should discuss their definition of done (DoD) and make changes to ensure there is common understanding of the acceptance criteria.

The team's agile project manager should facilitate the development of a new, detailed test procedure that all team members must follow.