A team now has six members: Secretary Zhang, Director Wang, Engineer Li, Engineer Yang, Zhao Ke, and Ma Ke. Now, due to working relationships, some members must be adjusted. It is known that: (1) only Wang and Only engineer Li and engineer Yang can keep Secretary Zhang; (2) if engineer Li is not adjusted, Zhao cannot be retained; (3) if Zhao is adjusted, then Ma must be adjusted; (4) Secretary Zhang is The core of the team cannot be adjusted. Based on this, you can launch. ['Retain Zhao member and adjust engineer Li.', 'Retaining Engineer Li and Engineer Yang.', 'Keep Zhao Zhao and adjust engineer Yang.', 'Retain Zhao and Ma Ke.']