As a secure coding consultant, Alice was called in to review a testing team's process. The team explained to Alice that with every new revision or code change, the team tests for potential new vulnerabilities. In later revisions, however, known vulnerabilities appear long after they were tested. What does Alice identify as the issue?

Question $4$ options:

The team should employ regression testing.

The team is conducting only automated testing; no manual code reviews are done.

The team lacks the skills to conduct code reviews.

The team is testing during the wrong phase of their development framework.