Explanation
According to the ISTQB Tester Foundation Level Agile Tester syllabus, one of the key principles of agile testing is that testers are integrated into the agile team and work closely with developers and other stakeholders. However, this does not mean that testers lose their independence or objectivity. Testers should still be able to provide an unbiased view of the quality of the software and challenge the assumptions and decisions made by the team. Therefore, option C is the best way for a test team to keep its independence when working in an agile development environment, as it allows testers to be part of the agile team, but also report to a different manager than the developers, who can support their professional development and ensure their independence. Option A is not a good way to keep independence, as it limits the transparency and collaboration between testers and developers, which are essential for agile testing. Option B is also not a good way to keep independence, as it creates a physical and organizational barrier between the test automation team and the agile development team, which can hinder communication and feedback. Option D is also not a good way to keep independence, as it creates an inconsistency and imbalance between the testers who are co-located with the agile development team and those who are not, which can affect the quality and efficiency of the testing process. References: ISTQB Tester Foundation Level Agile Tester syllabus, section 1.2.1, page 91; ISTQB Tester Foundation Level Agile Tester syllabus, section 1.2.2, page 101; ISTQB Tester Foundation Level Agile Tester syllabus, section 2.1.1, page 141; ISTQB Tester Foundation Level Agile Tester syllabus, section 2.2.1, page 161; ISTQB Tester Foundation Level Agile Tester syllabus, section 2.2.2, page 171.