Which sentences uses commas correctly? The Profile Project starts with an in-depth interview, the interview is followed by research with secondary sources

Which sentences uses commas correctly?

The Profile Project starts with an in-depth interview, the interview is followed by research with secondary sources.

The Profile Project handout states, "Then through research, writing, and reflection, you deepen your understanding of the ideas and contexts uncovered in the interview."

The Profile Project, however, first starts with an in-depth interview, which is followed by research with secondary sources.

To start the Profile Project, an in-depth interview, a form of primary research, is conducted.

The strange cool quirky Profile Project combines primary and secondary research.