My choice would be "Coordinating work with customer and other units of the organization".
Explanation:
The given options talk about team work and it purely depends on the responsibility assigned by Team lead to the team under him/her.
- Selecting new member: It has to be done by Lead of team because he/ she will be aware of the future works and needs.
- Scheduling work: This is once again in focus with near future assignments and the Lead would be the right person to schedule work to his/her team.
- Coordinating work: This can be done by work teams, because they are the actual person who work for the customer and they possess skill to coordinate with minimum guidelines.