A project is being managed by a project manager. A large portion of the work of the project is being subcontracted to an outside vendor. During the project it is found that a significant change in the design of the project is necessary. The project manager should:

a. Issue a change notice to the contractor immediately.

b. Issue a purchase order to investigate the change.

c. Notify the contractor of the design change possibility.

d. Rebid the contract.