Continuous Integration setup has been established for last few Sprints for an Agile project with team of $10$ members. The builds are scheduled every day in the morning and evening, In the Sprint Retrospective meeting. the Team members have raised the concern that in case of bulld failures, It is not easy to identify which programmer's code has caused the same. What is the corrective action recommended for this team?

Ensure unit testing is done before the code is checked in

Increase the build frequency and set up the tool to identify the code that caused failure

Identify one person who ensures the correctness of the build

Team can continue in the same manner for few more sprints and take corrective step only if is continues