You work as a Project Manager at ABC.com. You manage projects using Project Server 2010. You have created a project plan for a new proposed project. Due to changes in the project requirements, you need to modify the project plan. You attempt to modify the project plan but the project plan is opened in Read Only mode. How can you ensure that you can modify the project plan and save your changes?

A.
You should save the project plan with a different name.

B.
You should restart the workflow before modifying the project plan.

C.
You should checkout the project plan.

D.
You should force a check in of the project plan.