Project sponsors within the contractors company have the authority to change the scope of an external customers project as they see fit.
Answer
Have the authority to change the scope of an external customers project as they see fit.
Do not have the authority to change the scope of an external customers project as they see fit.
Have the authority to change the scope of an external customers project only once every six months
Have the authority to change the scope of an external customers project as long as the project manager and program manager are both in accord